转：jaxb解析xml替对象例子

转：jaxb解析xml为对象例子
原文http://weareold.iteye.com/blog/708543


通过jaxb方式把xml文件映射成bean对象。

1、新建java工程或者web工程都可以。
2、通过精简必须导入jar包
         activation.jar
        jaxb-api-2.0.jar
        jaxb-impl-2.0.1.jar
        jsr173_api-1.0.jar
3、 新建xml文件
    <?xml version="1.0" encoding="UTF-8"?>
    <root>

<template
   start="true"
   ip="127.0.0.1"
   port="3344"
   server="server"
/>
<template ... ... />
    </root>

4、新建bean对象，xml的映射文件。
Vo.java 如下

import javax.xml.bind.annotation.XmlAccessType;  import javax.xml.bind.annotation.XmlAccessorType;  import javax.xml.bind.annotation.XmlAttribute;  import javax.xml.bind.annotation.XmlRootElement;  import javax.xml.bind.annotation.XmlType;    @XmlAccessorType(XmlAccessType.FIELD)  @XmlType(name = "", propOrder = {  })  @XmlRootElement(name = "[color=red]template[/color]")  public class Vo {        @XmlAttribute      private String start;      @XmlAttribute      private String ip;      @XmlAttribute      private String port;      @XmlAttribute      private String server;                  public String getStart() {          return start;      }      public void setStart(String start) {          this.start = start;      }      public String getIp() {          return ip;      }      public void setIp(String ip) {          this.ip = ip;      }      public String getPort() {          return port;      }      public void setPort(String port) {          this.port = port;      }      public String getServer() {          return server;      }      public void setServer(String server) {          this.server = server;      }  }  

该文件对应xml文件中 循环节点 template 元素



Root.java 文件如下
Java代码  收藏代码

import java.util.ArrayList;  import java.util.List;    import javax.xml.bind.annotation.XmlAccessType;  import javax.xml.bind.annotation.XmlAccessorType;  import javax.xml.bind.annotation.XmlRootElement;  import javax.xml.bind.annotation.XmlType;    @XmlAccessorType(XmlAccessType.FIELD)  @XmlType(name = "", propOrder = {  })  @XmlRootElement(name = "[color=blue]root[/color]")  public class Root {            protected List<Vo> [color=red]template[/color];            public List<Vo> getTemplateList() {          if (template == null) {              template = new ArrayList<Vo>();          }          return this.template;      }  }  

注意bean对象与xml映射的关系。



5、 解析xml为bean类
Java代码  收藏代码

public static void gernateConfig() throws Exception{          StringBuffer buffer  = null;          JAXBContext jaxbContext;          try {                             //读入xml文件流                             InputStream is = Excecute.class.getResourceAsStream(“/conf/config.xml”);              BufferedReader in = new BufferedReader(new InputStreamReader(is));              buffer = new StringBuffer();              String line = "";              while ((line = in.readLine()) != null) {                  buffer.append(line);              }                            //加载映射bean类              jaxbContext = JAXBContext.newInstance(Root.class);                             //创建解析              Unmarshaller um = jaxbContext.createUnmarshaller();              StreamSource streamSource = new StreamSource(new StringReader(buffer.toString()));              Root root = (Root) um.unmarshal(streamSource);           } catch (Exception e) {              e.printStackTrace();              throw new Exception(e.getMessage());          }      }  

6、 把bean对象生成xml字符串方法
Java代码  收藏代码

public static String gernateConfigXml(Root root) throws Exception {          if (root != null) {              try {                  JAXBContext context = JAXBContext.newInstance(Root.class);                  Marshaller m = context.createMarshaller();                  m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);                  Writer writer = new StringWriter();                  m.marshal(root, writer);                  try {                      String xml = writer.toString();                      writer.flush();                      writer.close();                      return xml;                  } catch (IOException e) {                      return "";                  }              } catch (Exception e) {                  throw new Exception("失败!");              }          } else {              return null;          }      }  

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