jaxb解析xml為對象例子

青_春 2015-12-16

展開全文

通過jaxb方式把xml文件映射成bean對象。

1、新建java工程或者web工程都可以。
2、通過精簡必須導入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對象，xml的映射文件。
Vo.java 如下

Java代碼

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;
}
}

該文件對應xml文件中循環(huán)節(jié)點 template 元素

Root.java 文件如下

Java代碼

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對象與xml映射的關系。

5、解析xml為bean類

Java代碼

public static void gernateConfig() throws Exception{
StringBuffer buffer = null;
JAXBContext jaxbContext;
try {
//讀入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);
}
//加載映射bean類
jaxbContext = JAXBContext.newInstance(Root.class);
//創(chuàng)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());
}
}