java学习笔记(12) —— Struts2 通过 xml /json 实现简单的业务处理

时间：2024-05-26 16:36:20

XML

1、引入dom4j-2.0.0.jar

2、引入jquery-1.8.2.js

3、新建common.js

getInfo = function(){

    $.post("getXmlAction.action",{name:$('#name').val()},function(ret,status){

        if("success" == status)

            var id = $(ret).find("id").text();

            var age = $(ret).find("age").text();

            var address = $(ret).find("address").text();

            var name = $(ret).find("name").text();

            var html = "<table>" +

                    "<tr>" +

                    "<th>" +id+age+address+name

                    "</th>"+

                    "</tr>" +

                    "</table>"

             $('body table:eq(0)').remove();

             $('#xmlbody').append(html);

    });

}

getJson = function(){
    $.post("getJsonAction.action",{name:$('#name').val()},function(ret,status){
        if("success" == status){
        
        }
    });
}

4、新建xmlTest.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <script type="text/javascript" src="js/jquery-1.8.2.js"></script>

    <script type="text/javascript" src="scripts/common.js"></script>

  </head>

  <body id="xmlbody">

      <select id="name">

          <option value="james" selected="selected">james</option>

          <option value="currey">currey</option>

      </select>

      <input type="button" value="getInfo" onclick="getInfo();"/>

  </body>

</html>

5、修改struts.xml文件

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"

"http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>

    <package name="testSSH" extends="struts-default">

        <action name="getXmlAction" class="com.test.action.xml.GetXmlAction">

        </action>

    </package>

</struts>

6、新建GetXmlAction.java

package com.test.action.xml;

import java.io.PrintWriter;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.ServletActionContext;

import org.dom4j.*;

import org.dom4j.io.*;

import com.opensymphony.xwork2.ActionSupport;

public class GetXmlAction extends ActionSupport {

    private static final long serialVersionUID = 1L;

    private String name;

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    @Override

    public String execute() throws Exception {

        person person1 = new person();

        person1.setAge(11);

        person1.setName("james");

        person1.setId(1);

        person1.setAddress("beijing");

        person person2 = new person();

        person2.setId(2);

        person2.setAddress("shanghai");

        person2.setAge(12);

        person2.setName("currey");

        //创建 xml 对象

        Document document = DocumentHelper.createDocument();

        //创建根元素

        Element rootElement = document.addElement("users");

        Element userElement = rootElement.addElement("user");

        Element idElement = userElement.addElement("Id");

        Element ageElement = userElement.addElement("age");

        Element addressElement = userElement.addElement("address");

        Element nameElement = userElement.addElement("name");

        if("james".equals(this.name)){

            idElement.setText(person1.getId()+"");

            ageElement.setText(person1.getAge()+"");

            addressElement.setText(person1.getAddress());

            nameElement.setText(person1.getName());

        }else{

            idElement.setText(person2.getId()+"");

            ageElement.setText(person2.getAge()+"");

            addressElement.setText(person2.getAddress());

            nameElement.setText(person2.getName());

        }

        HttpServletResponse response = ServletActionContext.getResponse();

        //设置返回类型

        response.setContentType("text/xml; charset=UTF-8 ");

        //清除浏览器缓存

        response.setHeader("Cache-Control", "no-cache");

        //定义输出流

        PrintWriter out = response.getWriter();

        //定义格式

        OutputFormat format = OutputFormat.createPrettyPrint();

        format.setEncoding("utf-8");

        //定义XMLWriter 对象，将document 对象，输出到客户端

        XMLWriter writer  = new XMLWriter(out,format);

        writer.write(document);

        out.flush();

        out.close();

        return null;

    }

}

JSON

1、引入struts2-json-plugin.jar、json-lib.jar包

2、配置struts.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"

"http://struts.apache.org/dtds/struts-2.1.dtd">

<struts>
　　// 继承自json-default 而json-default继承自 struts-default

    <package name="testSSH" extends="json-default">

        //异步请求不定义返回值

        <action name="getXmlAction" class="com.test.action.xml.GetXmlAction"></action>
　　　　 //异步请求返回值为SUCCESS，定义类型为json 即可,客户端到服务端序列化的过程交由core 处理

        <action name="getJsonAction" class="com.test.action.json.GetJsonAction">

            <result name="success" type="json">
　　　　　　　　　//排除 属性 name MyAge【指向别名】

                <param name="excludeProperties">name,MyAge</param>
　　　　　　　　  // 只解析root

                <param name="root">person</param>

            </result>

        </action>

    </package>

</struts>

3、定义GetJsonAction.java

package com.test.action.json;

import org.apache.struts2.json.annotations.JSON;

import java.util.*;

import com.opensymphony.xwork2.ActionSupport;

import com.test.action.json.person;

public class GetJsonAction extends ActionSupport {

    private static final long serialVersionUID = 1L;

    //客户端传入的名称

    private String name;

    private int age;

    private String address; 

    private int id;

    private Date date;

    private person person = new person();

    public person getPerson() {

        return person;

    }

    public void setPerson(person person) {

        this.person = person;

    }

    @JSON(format = "yyyy-MM-dd")

    public Date getDate() {

        return date;

    }

    public void setDate(Date date) {

        this.date = date;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    @JSON(name = "MyAddress")

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

    @JSON(serialize=false)

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    //将Action 的成员变量序列化成json对象

    @Override

    public String execute() throws Exception {

        person person1 = new person();

        person1.setAge(11);

        person1.setName("james");

        person1.setId(1);

        person1.setAddress("beijing");

        person1.setDate(new Date());

        person person2 = new person();

        person2.setId(2);

        person2.setAddress("shanghai");

        person2.setAge(12);

        person2.setName("currey");

        person2.setDate(new Date());

        if("james".equals(this.name)){

            this.id = person1.getId();

            this.age = person1.getAge();

            this.address = person1.getAddress();

            this.date = person1.getDate();

        }else{

            this.id = person2.getId();

            this.age = person2.getAge();

            this.address = person2.getAddress();

            this.date = person2.getDate();

        }

        return SUCCESS;

    }

}

4、定义person属性类

package com.test.action.json;

import java.util.*;

public class person {

    private int id;

    private String name;

    private int age;

    private String address;

    private Date date;

    public Date getDate() {

        return date;

    }

    public void setDate(Date date) {

        this.date = date;

    }

    public int getId() {

        return id;

    }

    public void setId(int id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

}

5、引入jsonText.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <script type="text/javascript" src="js/jquery-1.8.2.js"></script>

    <script type="text/javascript" src="scripts/common.js"></script>

  </head>

  <body id="xmlbody">

      <select id="name">

          <option value="james" selected="selected">james</option>

          <option value="currey">currey</option>

      </select>

      <input type="button" value="getInfo" onclick="getJson();"/>

  </body>

</html>

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