Apache Commons包含了很多開源的工具，用于解決平時編程經常會遇到的問題，減少重復勞動。我選了一些比較常用的項目做簡單介紹。文中用了很多網上現成的東西，我只是做了一個匯總整理。?
Java代碼
//得到TeacherForm???? TeacherForm?teacherForm=(TeacherForm)form;? ?? //構造Teacher對象???? Teacher?teacher=new?Teacher();? ?? //賦值???? teacher.setName(teacherForm.getName());? ?? teacher.setAge(teacherForm.getAge());? ?? teacher.setGender(teacherForm.getGender());? ?? teacher.setMajor(teacherForm.getMajor());? ?? teacher.setDepartment(teacherForm.getDepartment());? ?? ?? //持久化Teacher對象到數據庫???? HibernateDAO=?;? ?? HibernateDAO.save(teacher);??? Java代碼?
//得到TeacherForm??? TeacherForm?teacherForm=(TeacherForm)form;??? //構造Teacher對象??? Teacher?teacher=new?Teacher();??? //賦值??? teacher.setName(teacherForm.getName());??? teacher.setAge(teacherForm.getAge());??? teacher.setGender(teacherForm.getGender());??? teacher.setMajor(teacherForm.getMajor());??? teacher.setDepartment(teacherForm.getDepartment());??? ?? //持久化Teacher對象到數據庫??? HibernateDAO=?;??? HibernateDAO.save(teacher);???
Java代碼?
//得到TeacherForm???? TeacherForm?teacherForm=(TeacherForm)form;? ?? //構造Teacher對象???? Teacher?teacher=new?Teacher();? ?? //賦值???? BeanUtils.copyProperties(teacher,teacherForm);? ?? //持久化Teacher對象到數據庫???? HibernateDAO=?;? ?? HibernateDAO.save(teacher);??? Java代碼??
//得到TeacherForm??? TeacherForm?teacherForm=(TeacherForm)form;??? //構造Teacher對象??? Teacher?teacher=new?Teacher();??? //賦值??? BeanUtils.copyProperties(teacher,teacherForm);??? //持久化Teacher對象到數據庫??? HibernateDAO=?;??? HibernateDAO.save(teacher);???
Java代碼?
//?create?Options?object???? Options?options?=?new?Options();? ?? //?add?t?option,?option?is?the?command?parameter,?false?indicates?that???? //?this?parameter?is?not?required.???? ?? options.addOption(“t”,?false,?“display?current?time”);? ?? options.addOption("c",?true,?"country?code");? ?? ?? CommandLineParser?parser?=?new?PosixParser();? ?? CommandLine?cmd?=?parser.parse(?options,?args);? ?? ?? if(cmd.hasOption("t"))?{? ?? //?print?the?date?and?time???? }else?{? ?? //?print?the?date???? }? ?? ?? //?get?c?option?value???? String?countryCode?=?cmd.getOptionValue("c");? ?? ?? if(countryCode?==?null)?{? ?? //?print?default?date???? }else?{? ?? //?print?date?for?country?specified?by?countryCode???? }??? Java代碼??
//?create?Options?object??? Options?options?=?new?Options();??? //?add?t?option,?option?is?the?command?parameter,?false?indicates?that??? //?this?parameter?is?not?required.??? ?? options.addOption(“t”,?false,?“display?current?time”);??? options.addOption("c",?true,?"country?code");??? ?? CommandLineParser?parser?=?new?PosixParser();??? CommandLine?cmd?=?parser.parse(?options,?args);??? ?? if(cmd.hasOption("t"))?{??? //?print?the?date?and?time??? }else?{??? //?print?the?date??? }??? ?? //?get?c?option?value??? String?countryCode?=?cmd.getOptionValue("c");??? ?? if(countryCode?==?null)?{??? //?print?default?date??? }else?{??? //?print?date?for?country?specified?by?countryCode??? }???
Java代碼?
OrderedMap?map?=?new ?LinkedMap();? ?? map.put("FIVE",?"5");? ?? map.put("SIX",?"6");? ?? map.put("SEVEN",?"7");? ?? map.firstKey();?//?returns?"FIVE"???? map.nextKey("FIVE");?//?returns?"SIX"???? map.nextKey("SIX");?//?returns?"SEVEN"?? Java代碼??
OrderedMap?map?=?new?LinkedMap();??? map.put("FIVE",?"5");??? map.put("SIX",?"6");??? map.put("SEVEN",?"7");??? map.firstKey();?//?returns?"FIVE"??? map.nextKey("FIVE");?//?returns?"SIX"??? map.nextKey("SIX");?//?returns?"SEVEN"??
1. Properties files 2. XML documents 3. Property list files (.plist) 4. JNDI 5. JDBC Datasource 6. System properties 7. Applet parameters 8. Servlet parameters
Java代碼?
#?usergui.properties,?definining?the?GUI,? ?? colors.background?=?#FFFFFF? ?? colors.foreground?=?#000080? ?? window.width?=?500? ?? window.height?=?300? ?? ?? PropertiesConfiguration?config?=?new?PropertiesConfiguration("usergui.properties");? ?? config.setProperty("colors.background",?"#000000);? ?? config.save();? ?? ?? config.save("usergui.backup.properties);//save?a?copy???? Integer?integer?=?config.getInteger("window.width");??? Java代碼??
#?usergui.properties,?definining?the?GUI,??? colors.background?=?#FFFFFF??? colors.foreground?=?#000080??? window.width?=?500??? window.height?=?300??? ?? PropertiesConfiguration?config?=?new?PropertiesConfiguration("usergui.properties");??? config.setProperty("colors.background",?"#000000);??? config.save();??? ?? config.save("usergui.backup.properties);//save?a?copy??? Integer?integer?=?config.getInteger("window.width");???
Java代碼?
import ?java.sql.*;? ???? import?com.gwnet.games.antiLord.util.*;? ?? ?? import?org.apache.commons.dbcp.ConnectionFactory;? ?? ?? import?org.apache.commons.dbcp.BasicDataSource;? ?? ?? import?org.apache.commons.dbcp.DataSourceConnectionFactory;? ?? ?? ?? ?? private?static?BasicDataSource?bds=new?BasicDataSource();? ?? ?? private?static?ConnectionFactory?fac=null;? ?? ?? ?? ?? //初始化連接池???? ?? bds.setDriverClassName(“org.postgresql.Driver”);?//數據庫驅動程序???? ?? bds.setUrl(“jdbc:postgresql://localhost:5432/myDB”);?//數據庫url???? ?? bds.setUsername(“postgres”);?//dba帳號???? ?? bds.setPassword(“XXXXXXXX”);?//密碼???? ?? bds.setInitialSize(100);?//初始化連接數量???? ?? bds.setMaxIdle(10);?//最大idle數???? ?? bds.setMaxWait(1000*60);?//超時回收時間???? ?? fac=new?DataSourceConnectionFactory(bds);?//得到連接工廠???? ?? Connection?conn=fac.createConnection();?//從池中獲得連接???? ?? conn.close();?//釋放連接，回到池中???? ?? ?? ?? //銷毀連接池???? ?? bds.close();? ?? bds=null;? ?? fac=null;??? Java代碼??
import?java.sql.*;??? ?? import?com.gwnet.games.antiLord.util.*;??? ?? import?org.apache.commons.dbcp.ConnectionFactory;??? ?? import?org.apache.commons.dbcp.BasicDataSource;??? ?? import?org.apache.commons.dbcp.DataSourceConnectionFactory;??? ?? ?? ?? private?static?BasicDataSource?bds=new?BasicDataSource();??? ?? private?static?ConnectionFactory?fac=null;??? ?? ?? ?? //初始化連接池??? ?? bds.setDriverClassName(“org.postgresql.Driver”);?//數據庫驅動程序??? ?? bds.setUrl(“jdbc:postgresql://localhost:5432/myDB”);?//數據庫url??? ?? bds.setUsername(“postgres”);?//dba帳號??? ?? bds.setPassword(“XXXXXXXX”);?//密碼??? ?? bds.setInitialSize(100);?//初始化連接數量??? ?? bds.setMaxIdle(10);?//最大idle數??? ?? bds.setMaxWait(1000*60);?//超時回收時間??? ?? fac=new?DataSourceConnectionFactory(bds);?//得到連接工廠??? ?? Connection?conn=fac.createConnection();?//從池中獲得連接??? ?? conn.close();?//釋放連接，回到池中??? ?? ?? ?? //銷毀連接池??? ?? bds.close();??? bds=null;??? fac=null;???
Java代碼?
QueryRunner?run?=?new ?QueryRunner(dataSource);? ?? ?? //?Execute?the?query?and?get?the?results?back?from?the?handler???? Object[]?result?=?(Object[])?run.query("SELECT?*?FROM?Person?WHERE?name=?",?"John?Doe");??? Java代碼??
QueryRunner?run?=?new?QueryRunner(dataSource);??? ?? //?Execute?the?query?and?get?the?results?back?from?the?handler??? Object[]?result?=?(Object[])?run.query("SELECT?*?FROM?Person?WHERE?name=?",?"John?Doe");???
Java代碼?
//?Create?a?factory?for?disk-based?file?items???? FileItemFactory?factory?=?new?DiskFileItemFactory();? ?? //?Create?a?new?file?upload?handler???? ServletFileUpload?upload?=?new?ServletFileUpload(factory);? ?? ?? //?Parse?the?request???? List?/*?FileItem?*/?items?=?upload.parseRequest(request);? ?? //?Process?the?uploaded?items???? Iterator?iter?=?items.iterator();? ?? while?(iter.hasNext())?{? ?? FileItem?item?=?(FileItem)?iter.next();? ?? if?(item.isFormField())?{? ?? processFormField(item);? ?? }?else?{? ?? processUploadedFile(item);? ?? }? ?? }??? Java代碼??
//?Create?a?factory?for?disk-based?file?items??? FileItemFactory?factory?=?new?DiskFileItemFactory();??? //?Create?a?new?file?upload?handler??? ServletFileUpload?upload?=?new?ServletFileUpload(factory);??? ?? //?Parse?the?request??? List?/*?FileItem?*/?items?=?upload.parseRequest(request);??? //?Process?the?uploaded?items??? Iterator?iter?=?items.iterator();??? while?(iter.hasNext())?{??? FileItem?item?=?(FileItem)?iter.next();??? if?(item.isFormField())?{??? processFormField(item);??? }?else?{??? processUploadedFile(item);??? }??? }???
Java代碼?
GetMethod?get?=?new ?GetMethod("http://jakarta.apache.org");? ?? ?? //?execute?method?and?handle?any?error?responses.???? ?? ...? ?? ?? InputStream?in?=?get.getResponseBodyAsStream();? ?? //?Process?the?data?from?the?input?stream.???? get.releaseConnection();??? Java代碼??
GetMethod?get?=?new?GetMethod("http://jakarta.apache.org");??? ?? //?execute?method?and?handle?any?error?responses.??? ?? ...??? ?? InputStream?in?=?get.getResponseBodyAsStream();??? //?Process?the?data?from?the?input?stream.??? get.releaseConnection();???
Java代碼?
InputStream?in?=?new ?URL(?"http://jakarta.apache.org"?).openStream();? ?? try?{? ?? InputStreamReader?inR?=?new?InputStreamReader(?in?);? ?? BufferedReader?buf?=?new?BufferedReader(?inR?);? ?? String?line;? ?? while?(?(?line?=?buf.readLine()?)?!=?null?)?{? ?? System.out.println(?line?);? ?? }? ?? }?finally?{? ?? in.close();? ?? }??? Java代碼??
InputStream?in?=?new?URL(?"http://jakarta.apache.org"?).openStream();??? try?{??? InputStreamReader?inR?=?new?InputStreamReader(?in?);??? BufferedReader?buf?=?new?BufferedReader(?inR?);??? String?line;??? while?(?(?line?=?buf.readLine()?)?!=?null?)?{??? System.out.println(?line?);??? }??? }?finally?{??? in.close();??? }???
Java代碼?
InputStream?in?=?new ?URL(?"http://jakarta.apache.org"?).openStream();? ?? try?{? ?? System.out.println(?IOUtils.toString(?in?)?);? ?? }?finally?{? ?? IOUtils.closeQuietly(in);? ?? }??? Java代碼??
InputStream?in?=?new?URL(?"http://jakarta.apache.org"?).openStream();??? try?{??? System.out.println(?IOUtils.toString(?in?)?);??? }?finally?{??? IOUtils.closeQuietly(in);??? }???
Java代碼?
File?file?=?new ?File("/commons/io/project.properties");? ?? List?lines?=?FileUtils.readLines(file,?"UTF-8");??? Java代碼??
File?file?=?new?File("/commons/io/project.properties");??? List?lines?=?FileUtils.readLines(file,?"UTF-8");???
Java代碼?
long ?freeSpace?=?FileSystemUtils.freeSpace("C:/");??? Java代碼??
long?freeSpace?=?FileSystemUtils.freeSpace("C:/");???
Java代碼?
Address?address?=?(Address)JXPathContext.newContext(vendor).? ?? getValue("locations[address/zipCode='90210']/address");??? Java代碼?
Address?address?=?(Address)JXPathContext.newContext(vendor).??? getValue("locations[address/zipCode='90210']/address");???
Java代碼?
Address?address?=?null ;? ?? Collection?locations?=?vendor.getLocations();? ?? Iterator?it?=?locations.iterator();? ?? while?(it.hasNext()){? ?? Location?location?=?(Location)it.next();? ?? String?zipCode?=?location.getAddress().getZipCode();? ?? if?(zipCode.equals("90210")){? ?? address?=?location.getAddress();? ?? break;? ?? }? ?? }??? Java代碼??
Address?address?=?null;??? Collection?locations?=?vendor.getLocations();??? Iterator?it?=?locations.iterator();??? while?(it.hasNext()){??? Location?location?=?(Location)it.next();??? String?zipCode?=?location.getAddress().getZipCode();??? if?(zipCode.equals("90210")){??? address?=?location.getAddress();??? break;??? }??? }???
1. FTP 2. NNTP 3. SMTP 4. POP3 5. Telnet 6. TFTP 7. Finger 8. Whois 9. rexec/rcmd/rlogin 10. Time (rdate) and Daytime 11. Echo 12. Discard 13. NTP/SNTP
Java代碼?
TelnetClient?telnet?=?new ?TelnetClient();? ?? telnet.connect(?"192.168.1.99",?23?);? ?? InputStream?in?=?telnet.getInputStream();? ?? PrintStream?out?=?new?PrintStream(?telnet.getOutputStream()?);? ?? ...? ?? telnet.close();??? Java代碼??
TelnetClient?telnet?=?new?TelnetClient();??? telnet.connect(?"192.168.1.99",?23?);??? InputStream?in?=?telnet.getInputStream();??? PrintStream?out?=?new?PrintStream(?telnet.getOutputStream()?);??? ...??? telnet.close();???
Java代碼?
//?Get?the?Date?validator???? DateValidator?validator?=?DateValidator.getInstance();? ?? //?Validate/Convert?the?date???? Date?fooDate?=?validator.validate(fooString,?"dd/MM/yyyy");? ?? if?(fooDate?==?null)?{? ?? //?error...not?a?valid?date???? return;? ?? }??? Java代碼??
//?Get?the?Date?validator??? DateValidator?validator?=?DateValidator.getInstance();??? //?Validate/Convert?the?date??? Date?fooDate?=?validator.validate(fooString,?"dd/MM/yyyy");??? if?(fooDate?==?null)?{??? //?error...not?a?valid?date??? return;??? }???
1. CIFS 2. FTP 3. Local Files 4. HTTP and HTTPS 5. SFTP 6. Temporary Files 7. WebDAV 8. Zip, Jar and Tar (uncompressed, tgz or tbz2) 9. gzip and bzip2 10. res 11. ram 這個包的功能很強大，極大的簡化了程序對資源的訪問。?
Java代碼?
//?Locate?the?Jar?file???? FileSystemManager?fsManager?=?VFS.getManager();? ?? FileObject?jarFile?=?fsManager.resolveFile(?"jar:lib/aJarFile.jar"?);? ?? ?? //?List?the?children?of?the?Jar?file???? FileObject[]?children?=?jarFile.getChildren();? ?? System.out.println(?"Children?of?"?+?jarFile.getName().getURI()?);? ?? for?(?int?i?=?0;?i?<?children.length;?i++?){? ?? System.out.println(?children[?i?].getName().getBaseName()?);? ?? }??? Java代碼??
//?Locate?the?Jar?file??? FileSystemManager?fsManager?=?VFS.getManager();??? FileObject?jarFile?=?fsManager.resolveFile(?"jar:lib/aJarFile.jar"?);??? ?? //?List?the?children?of?the?Jar?file??? FileObject[]?children?=?jarFile.getChildren();??? System.out.println(?"Children?of?"?+?jarFile.getName().getURI()?);??? for?(?int?i?=?0;?i?<?children.length;?i++?){??? System.out.println(?children[?i?].getName().getBaseName()?);??? }???
Java代碼?
StaticUserAuthenticator?auth?=?new ?StaticUserAuthenticator("username",?"password",?null );? ?? FileSystemOptions?opts?=?new?FileSystemOptions();? ?? DefaultFileSystemConfigBuilder.getInstance().setUserAuthenticator(opts,?auth);? ?? FileObject?fo?=?VFS.getManager().resolveFile("smb://host/anyshare/dir",?opts);?? Java代碼??
StaticUserAuthenticator?auth?=?new?StaticUserAuthenticator("username",?"password",?null);??? FileSystemOptions?opts?=?new?FileSystemOptions();??? DefaultFileSystemConfigBuilder.getInstance().setUserAuthenticator(opts,?auth);??? FileObject?fo?=?VFS.getManager().resolveFile("smb://host/anyshare/dir",?opts);??
Java代碼?
SimpleEmail?email?=?new ?SimpleEmail();? ?? //smtp?host???? email.setHostName("mail.test.com");? ?? //登陸郵件服務器的用戶名和密碼???? email.setAuthentication("test","testpassword");? ?? //接收人???? email.addTo("jdoe@somewhere.org",?"John?Doe");? ?? //發送人???? email.setFrom("me@apache.org",?"Me");? ?? //標題???? email.setSubject("Test?message");? ?? //郵件內容???? email.setMsg("This?is?a?simple?test?of?commons-email");? ?? //發送???? email.send();??? Java代碼??
SimpleEmail?email?=?new?SimpleEmail();??? //smtp?host??? email.setHostName("mail.test.com");??? //登陸郵件服務器的用戶名和密碼??? email.setAuthentication("test","testpassword");??? //接收人??? email.addTo("jdoe@somewhere.org",?"John?Doe");??? //發送人??? email.setFrom("me@apache.org",?"Me");??? //標題??? email.setSubject("Test?message");??? //郵件內容??? email.setMsg("This?is?a?simple?test?of?commons-email");??? //發送??? email.send();???
Java代碼?
//附件，可以定義多個附件對象???? EmailAttachment?attachment?=?new?EmailAttachment();? ?? attachment.setPath("e:\\1.pdf");? ?? attachment.setDisposition(EmailAttachment.ATTACHMENT);? ?? attachment.setDescription("Picture?of?John");? ?? //???? MultiPartEmail?email?=?new?MultiPartEmail();? ?? //smtp?host???? email.setHostName("mail.test.com");? ?? //登陸郵件服務器的用戶名和密碼???? email.setAuthentication("test","testpassword");? ?? //接收人???? email.addTo("jdoe@somewhere.org",?"John?Doe");? ?? //發送人???? email.setFrom("me@apache.org",?"Me");? ?? //標題???? email.setSubject("Test?message");? ?? //郵件內容???? email.setMsg("This?is?a?simple?test?of?commons-email");? ?? //添加附件???? email.attach(attachment);? ?? //發送???? email.send();??? Java代碼??
//附件，可以定義多個附件對象??? EmailAttachment?attachment?=?new?EmailAttachment();??? attachment.setPath("e:\\1.pdf");??? attachment.setDisposition(EmailAttachment.ATTACHMENT);??? attachment.setDescription("Picture?of?John");??? //??? MultiPartEmail?email?=?new?MultiPartEmail();??? //smtp?host??? email.setHostName("mail.test.com");??? //登陸郵件服務器的用戶名和密碼??? email.setAuthentication("test","testpassword");??? //接收人??? email.addTo("jdoe@somewhere.org",?"John?Doe");??? //發送人??? email.setFrom("me@apache.org",?"Me");??? //標題??? email.setSubject("Test?message");??? //郵件內容??? email.setMsg("This?is?a?simple?test?of?commons-email");??? //添加附件??? email.attach(attachment);??? //發送??? email.send();???
Java代碼?
//附件，可以定義多個附件對象???? EmailAttachment?attachment?=?new?EmailAttachment();? ?? attachment.setPath("e:\\1.pdf");? ?? attachment.setDisposition(EmailAttachment.ATTACHMENT);? ?? attachment.setDescription("Picture?of?John");? ?? //???? HtmlEmail?email?=?new?HtmlEmail?();? ?? //smtp?host???? email.setHostName("mail.test.com");? ?? //登陸郵件服務器的用戶名和密碼???? email.setAuthentication("test","testpassword");? ?? //接收人???? email.addTo("jdoe@somewhere.org",?"John?Doe");? ?? //發送人???? email.setFrom("me@apache.org",?"Me");? ?? //標題???? email.setSubject("Test?message");? ?? //郵件內容???? email.setHtmlMsg("This?is?a?simple?test?of?commons-email");? ?? //添加附件???? email.attach(attachment);? ?? //發送??? Java代碼??
//附件，可以定義多個附件對象??? EmailAttachment?attachment?=?new?EmailAttachment();??? attachment.setPath("e:\\1.pdf");??? attachment.setDisposition(EmailAttachment.ATTACHMENT);??? attachment.setDescription("Picture?of?John");??? //??? HtmlEmail?email?=?new?HtmlEmail?();??? //smtp?host??? email.setHostName("mail.test.com");??? //登陸郵件服務器的用戶名和密碼??? email.setAuthentication("test","testpassword");??? //接收人??? email.addTo("jdoe@somewhere.org",?"John?Doe");??? //發送人??? email.setFrom("me@apache.org",?"Me");??? //標題??? email.setSubject("Test?message");??? //郵件內容??? email.setHtmlMsg("This?is?a?simple?test?of?commons-email");??? //添加附件??? email.attach(attachment);??? //發送???
1. makeObject is called whenever a new instance is needed. 2. activateObject is invoked on every instance before it is returned from the pool. 3. passivateObject is invoked on every instance when it is returned to the pool. 4. destroyObject is invoked on every instance when it is being "dropped" from the pool (whether due to the response from validateObject, or for reasons specific to the pool implementation.) 5. validateObject is invoked in an implementation-specific fashion to determine if an instance is still valid to be returned by the pool. It will only be invoked on an "activated" instance.
Java代碼?
//生成一個digester。主要需要引進commons-logging.jar、commons-collections.jar、commons-?beanutils.jar???? Digester?digester?=?new?Digester();? ?? ?? //設置對XML文檔資料是否進行DTD驗證???? digester.setValidating(?false?);? ?? ?? //當遇見?catalog?元素的時候，產生一個Catalog對象???? digester.addObjectCreate(?"catalog",?Catalog.class?);? ?? ?? //當遇見?catalog?元素下面的book的時候，產生一個Book對象???? digester.addObjectCreate(?"catalog/book",?Book.class?);? ?? //?當遇見?catalog?元素下面的book的author時候，調用author屬性的Set方法???? digester.addBeanPropertySetter(?"catalog/book/author",?"author"?);? ?? digester.addBeanPropertySetter(?"catalog/book/title",?"title"?);? ?? //當再一次遇見?catalog?元素下面的book的時候，調用catalog類的addBook（）方法???? digester.addSetNext(?"catalog/book",?"addBook"?);? ?? ?? digester.addObjectCreate(?"catalog/magazine",?Magazine.class?);? ?? digester.addBeanPropertySetter(?"catalog/magazine/name",?"name"?);? ?? ?? digester.addObjectCreate(?"catalog/magazine/article",?Article.class?);? ?? //addSetProperties（）是將對應元素的屬性賦值。???? digester.addSetProperties(?"catalog/magazine/article",?"page",?"page"?);? ?? digester.addBeanPropertySetter(?"catalog/magazine/article/headline"?);? ?? digester.addSetNext(?"catalog/magazine/article",?"addArticle"?);? ?? ?? digester.addSetNext(?"catalog/magazine",?"addMagazine"?);? ?? \Digester\\catalog.xml"為XML文檔???? File?input?=?new?File(?"F:\\Digester\\catalog.xml"?);? ?? Catalog?c?=?(Catalog)digester.parse(?input?);? ?? System.out.println(?c.toString()?);
轉載于:https://www.cnblogs.com/hejiajunsh/archive/2013/02/06/2906478.html
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