ServerForXML网络编程

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发布于 2019-02-21 15:28:09

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发布于 2019-02-21 15:28:09

文章被收录于专栏：刘晓杰刘晓杰

第一步

新建Dynamic Web Project，名称为ServerForXML（该勾选的勾上）。

第二步：服务器端

1.建立并实现服务端的业务类 Java Resources–>src–>新建serverlet

Java Package选择“com.example.server.xml” Class Name选择“ServletForXML” 然后一路next。最后会自动打开ServerForXML.java文件

2.在web.xml文件中配置新建的ServerForXML 目录文件结构如下

打开web.xml。在

<display-name>ServerForXML</display-name>
  <welcome-file-list>

这两行之间插入

  <servlet>
      <servlet-name>ServletForXML</servlet-name>
      <servlet-class>com.example.server.xml.ServletForXML</servlet-class>
  </servlet>
  <servlet-mapping>
      <servlet-name>ServletForXML</servlet-name>
      <url-pattern>/ServletForXML</url-pattern>
  </servlet-mapping>

3.建立业务Bean，实现业务方法 （1）先在src文件夹下新建一个包（service）。然后新建News.java

package service;

public class News {
    private Integer id;
    //java支持自动包箱解箱。定义为int也可以
    private String title;
    private Integer timelength;

    public News(Integer id, String title, Integer timelength) {
        super();
        this.id = id;
        this.title = title;
        this.timelength = timelength;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public Integer getTimelength() {
        return timelength;
    }

    public void setTimelength(Integer timelength) {
        this.timelength = timelength;
    }
}

（2）然后新建接口XMLService.java

package service;

import java.util.List;

public interface XMLService {
    public List<News> getLastNews();
}

（3）建立实体类XMLServiceBean继承接口

package service;

import java.util.ArrayList;
import java.util.List;

public class XMLServiceBean implements XMLService {

    @Override
    public List<News> getLastNews() {
        List<News> list = new ArrayList<News>();
        list.add(new News(10, "lxj", 20));
        list.add(new News(20, "lxj", 100));
        list.add(new News(30, "lxj", 50));
        return list;
    }
}

（4）最后完成ServletForXML.java的编写

package com.example.server.xml;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import service.News;
import service.XMLServiceBean;

/**
 * Servlet implementation class ServletForXML
 */
@WebServlet("/ServletForXML")//注意，如果在web.xml里面注册过servlet，请一定要注释掉，否则报错
public class ServletForXML extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private XMLServiceBean service = new XMLServiceBean();// ****************

    /**
     * @see HttpServlet#HttpServlet()
     */
    public ServletForXML() {
        super();
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);// *************************
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        List<News> news = service.getLastNews();
        request.setAttribute("news", news);
        request.getRequestDispatcher("/WEB-INF/page/NewFile.xml").forward(request,
                response);
        //转向某个界面
    }
}

教程上给出的jsp文件运行不了，不过在这里我还是给出 news.jsp

<%@ page language="java" contentType="text/xml; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<?xml version="1.0" encoding="UTF-8"?>
<videonews> 
    <c:forEach items="${news}" var="list">
        <news id="${list.id}"> 
            <title>${list.title}</title> 
            <timelength>${list.timelength}</timelength>
        </news>
    </c:forEach> 
</videonews>

我用的是自己写的NewFile.xml.当然，之前写的很多文件（从3建立业务开始）都没用了

<?xml version="1.0" encoding="UTF-8"?>
<persons>
    <person id="23">
        <name>NEwii</name>
        <age>21</age>
    </person>
    <person id="20">
        <name>wiiWill</name>
        <age>25</age>
    </person>
</persons>

4.run on server开始测试

成功

第三步：编写客户端

1.创建android工程GetXMLFromInternet

2.添加网络权限

3.main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.getxmlfrominternet.MainActivity" >

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </ListView>

</LinearLayout>

4.MainActivity.java

package com.example.getxmlfrominternet;

import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
    private ListView listview;
    private ArrayAdapter<String> adapter;
    private List<Person> personList;
    private Handler myHandler = new Handler(){
        public void handleMessage(Message msg) {
            if(msg.what == 1){
                for (int i = 0; i < personList.size(); i++) {
                    adapter.add(personList.get(i).toString());
                }
                listview.setAdapter(adapter);
            }
        };
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        listview = (ListView) findViewById(R.id.listview);
        adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_expandable_list_item_1);

        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    personList = PullPersonService.getPersons();
                    myHandler.sendEmptyMessage(1);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }).start();
    }
}

5.工具类 Person.java

package com.example.getxmlfrominternet;

public class Person {
    private int id;
    private String name;
    private Short age;

    public Person() {
    }

    public Person(int id, String name, Short age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    public Person(String name, Short age) {
        this.name = name;
        this.age = age;
    }

    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 Short getAge() {
        return age;
    }

    public void setAge(Short age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "id=" + id + ",name=" + name + ",age=" + age;
    }
}

PullPersonService.java

package com.example.getxmlfrominternet;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import android.util.Log;
import android.util.Xml;

public class PullPersonService {
    public static List<Person> getPersons() throws Exception{
        String path = "http://10.107.56.64:8080/ServerForXML/ServletForXML";
        HttpURLConnection connection = (HttpURLConnection) new URL(path)
                .openConnection();
        connection.setConnectTimeout(5000);
        connection.setRequestMethod("GET");
        if(connection.getResponseCode() == 200){
            InputStream inputStream = connection.getInputStream();
            return XMLParse(inputStream);
        }
        return null;
    }

    //如何解析请看
    //http://blog.csdn.net/lxj1137800599/article/details/50774788
    //http://blog.csdn.net/lxj1137800599/article/details/50777322
    private static List<Person> XMLParse(InputStream inputStream) throws Exception {
        Person person = null;
        List<Person> list = null;

        XmlPullParser pullParser = Xml.newPullParser();
        pullParser.setInput(inputStream, "UTF-8");
        int event = pullParser.getEventType();// 触发第一个事件
        while (event != XmlPullParser.END_DOCUMENT) {
            switch (event) {
            case XmlPullParser.START_DOCUMENT:
                list = new ArrayList<Person>();
                break;
            case XmlPullParser.START_TAG:
                if ("person".equals(pullParser.getName())) {
                    int id = Integer.valueOf(pullParser.getAttributeValue(0));
                    person = new Person();
                    person.setId(id);
                }
                if (person != null) {
                    if ("name".equals(pullParser.getName())) {
                        person.setName(pullParser.nextText());
                    }
                    if ("age".equals(pullParser.getName())) {
                        person.setAge(new Short(pullParser.nextText()));
                        Log.i("TAG", person.toString());
                    }
                }
                break;
            case XmlPullParser.END_TAG:
                if ("person".equals(pullParser.getName())) {
                    list.add(person);
                    person = null;
                }
                break;
            }
            event = pullParser.next();
        }
        return list;
    }
}

6.效果展示