ajax从服务端获取数据(服务端返回html、xml)

ajax的本质就是，发送http请求的工作交给js中的XMLHttpRequest对象去做！

 

ajax知识
ajax的本质就是，发送http请求的工作交给js中的XMLHttpRequest对象去做








 



 

 

package com.jiongmeng.entity;

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

public class News {
	
	private String id;
	private String title;
	
	public News() {
		super();
	}

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

	public String getId() {
		return id;
	}

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

	public String getTitle() {
		return title;
	}

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

	public List showNews() {
		List news = new ArrayList();
		news.add(new News("1", "杨幂和魏大勋传出绯闻"));
		news.add(new News("2", "林志玲结婚啦"));
		news.add(new News("3", "朝鲜半岛局势剑拔弩张"));
		news.add(new News("4", "黄晓明确认参加《中餐厅》录制"));
		news.add(new News("5", "鹿晗和关晓彤深夜撒狗粮"));
		news.add(new News("6", "林志玲开直播，网友直呼认不出来了！"));
		return news;
	}
	
	

}

package com.jiongmeng.ajax;

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

import javax.servlet.ServletConfig;
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 com.jiongmeng.entity.News;

/**
 * 获取新闻列表
 */
@WebServlet("/ajaxNewsList")
public class AjaxNewsList extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter pw = response.getWriter();
		News news = new News();
		StringBuffer sb = new StringBuffer();
		List newsList = news.showNews();
		for (News newInfo : newsList) {
			String id = newInfo.getId();
			String title = newInfo.getTitle();
			//直接在服务端拼接成html，直接返回html给客户端，让客户端自己去处理这段html
			sb.append("
" + title + "
");
		}
		try {
			// 模拟网络慢的情况
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println(sb.toString());
		pw.print(sb.toString());
		pw.flush();
		pw.close();
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

	@Override
	public void init(ServletConfig config) throws ServletException {

	}

}

 

package com.jiongmeng.ajax;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
 * 获取xml数据
 */
@WebServlet("/ajaxXml")
public class AjaxXml extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/xml;charset=UTF-8");
		PrintWriter pw = response.getWriter();
		StringBuffer sb = new StringBuffer();
		sb.append("");
		sb.append("笑傲江湖金庸");
		sb.append("小李飞刀古龙");
		sb.append("水浒传施耐庵");
		sb.append("西游记吴承恩");
		sb.append("三国演义罗贯中");
		sb.append("红楼梦曹雪芹");
		sb.append("");
		try {
			// 模拟网络慢的情况
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println(sb.toString());
		pw.print(sb.toString());
		pw.flush();
		pw.close();
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}

	@Override
	public void init(ServletConfig config) throws ServletException {

	}

}

books.xml

鹿鼎记金庸
萍踪侠影梁羽生
笑傲江湖金庸
小李飞刀古龙
四大名捕温瑞安

 

完！