ajax傳輸xml數據:只要把數據封裝成xml格式就可以實現傳輸,前台js用responseXML接收xml參數,後台讀取用流和dom4j來解析
前台頁面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Ajax XML數據處理演示</title> <script type="text/javascript"> //get方式ajax function send1(){ alert("ok"); var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xhr=null; if(window.XMLHttpRequest){ xhr=new XMLHttpRequest(); }else{ xhr=new ActiveXObject("Microsoft.XMLHttp"); } var url="<c:url value='/XmlServlet?name='/>"+name+"&age="+age; //3設置訪問方式 xhr.open("GET", url, true); //4設置訪問成功返回後的操作 xhr.onreadystatechange=function(){ if(xhr.readyState==4){//返回 if(xhr.status==200){//響應代碼正常 var txt=xhr.responseText; alert(txt); } } }; xhr.send(null); } </script> <!-- 前台以xml的格式向服務器發送數據 --> <script type="text/javascript"> //post方式ajax function send2(){ alert("222"); //1創建ajax對象 var xhr = null; if(window.XMLHttpRequest){//高版本 xhr = new XMLHttpRequest(); }else{//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2請求地址 var url = "<c:url value='/XmlServlet'/>"; //3設置訪問方式 xhr.open("POST", url, true); //4設置訪問成功返回後的操作 xhr.onreadystatechange=function(){ if(xhr.readyState==4){//返回 if(xhr.status==200){//響應代碼正常 var xmlObj=xhr.responseXML; var users=xmlObj.getElementsByTagName("user"); for(var i=0;i<users.length;i++){ var id=users[i].getAttribute("id"); var name=users[i].childNodes[0].firstChild.data;//xml中的dom模型中的操作方法,和html中有點小差別 var age=users[i].childNodes[1].firstChild.data;//不能用childNodes["age"] alert(id+","+name+","+age); } } } }; var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xml="<user><name>"+name+"</name><age>"+age+"</age></user>"; xhr.send(xml); } </script> </head> <body> Name: <input type="text" name="name"> <br /> Age: <input type="text" name="age"> <br /> <input type="button" value="Get提交" onclick="send1();" /> <br /> <input type="button" value="Post提交" onclick="send2()" /> <br /> </body> </html>
後台頁面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Ajax XML數據處理演示</title> <script type="text/javascript"> //get方式ajax function send1(){ alert("ok"); var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xhr=null; if(window.XMLHttpRequest){ xhr=new XMLHttpRequest(); }else{ xhr=new ActiveXObject("Microsoft.XMLHttp"); } var url="<c:url value='/XmlServlet?name='/>"+name+"&age="+age; //3設置訪問方式 xhr.open("GET", url, true); //4設置訪問成功返回後的操作 xhr.onreadystatechange=function(){ if(xhr.readyState==4){//返回 if(xhr.status==200){//響應代碼正常 var txt=xhr.responseText; alert(txt); } } }; xhr.send(null); } </script> <!-- 前台以xml的格式向服務器發送數據 --> <script type="text/javascript"> //post方式ajax function send2(){ alert("222"); //1創建ajax對象 var xhr = null; if(window.XMLHttpRequest){//高版本 xhr = new XMLHttpRequest(); }else{//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2請求地址 var url = "<c:url value='/XmlServlet'/>"; //3設置訪問方式 xhr.open("POST", url, true); //4設置訪問成功返回後的操作 xhr.onreadystatechange=function(){ if(xhr.readyState==4){//返回 if(xhr.status==200){//響應代碼正常 var xmlObj=xhr.responseXML; var users=xmlObj.getElementsByTagName("user"); for(var i=0;i<users.length;i++){ var id=users[i].getAttribute("id"); var name=users[i].childNodes[0].firstChild.data;//xml中的dom模型中的操作方法,和html中有點小差別 var age=users[i].childNodes[1].firstChild.data;//不能用childNodes["age"] alert(id+","+name+","+age); } } } }; var name=document.getElementsByName("name")[0].value; var age=document.getElementsByName("age")[0].value; var xml="<user><name>"+name+"</name><age>"+age+"</age></user>"; xhr.send(xml); } </script> </head> <body> Name: <input type="text" name="name"> <br /> Age: <input type="text" name="age"> <br /> <input type="button" value="Get提交" onclick="send1();" /> <br /> <input type="button" value="Post提交" onclick="send2()" /> <br /> </body> </html>
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Ajax傳輸Json數據的要點利用Apache或者阿裡巴巴的JSONArray類進行傳輸
前台代碼
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>Ajax Json數據處理演示</title> <script type="text/javascript"> function ask1() { //1創建ajax對象 var xhr = null; if (window.XMLHttpRequest) {//高版本 xhr = new XMLHttpRequest(); } else {//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2請求地址 var url = "<c:url value='/JsonServlet1'/>"; //3設置訪問方式 xhr.open("POST", url, true); //4設置訪問成功返回後的操作 xhr.onreadystatechange = function() { if (xhr.readyState == 4) {//返回 if (xhr.status == 200) {//響應代碼正常 //※※※※※解析後台返回的json串 //js中eval()方法的功能:是校驗參數文本串符合js中哪一種數據類型,並把其轉換成對應類型的對象 var txt = xhr.responseText; var users = eval("(" + txt + ")"); //把符合json格式的文本串 轉換成 json對象 for ( var i = 0; i < users.length; i++) { alert(users[i].id + "," + users[i].name + "," + users[i].age); } } } }; //5 發送 xhr.send(null); } function ask2() { //1創建ajax對象 var xhr = null; if (window.XMLHttpRequest) {//高版本 xhr = new XMLHttpRequest(); } else {//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2請求地址 var url = "<c:url value='/JsonServlet2'/>"; //3設置訪問方式 xhr.open("POST", url, true); //4設置訪問成功返回後的操作 xhr.onreadystatechange = function() { if (xhr.readyState == 4) {//返回 if (xhr.status == 200) {//響應代碼正常 //※※※※※解析後台返回的json串 //js中eval()方法的功能:是校驗參數文本串符合js中哪一種數據類型,並把其轉換成對應類型的對象 var txt = xhr.responseText; //alert(txt); //把符合json格式的文本串 轉換成 json對象 var users = eval("(" + txt + ")"); for ( var key in users)//map的便利方式 alert("屬性:" + key + ",值:" + users[key]); } //for ( var i = 0; i < users.length; i++) {//list的遍歷方式 //alert(users[i].id +","+users[i].name+","+users[i].age); //} }; }; //5 發送 xhr.send(null); } function ask3() { //1創建ajax對象 var xhr = null; if (window.XMLHttpRequest) {//高版本 xhr = new XMLHttpRequest(); } else {//低版本 xhr = new ActiveXObject("Microsoft.XMLHttp"); } //2請求地址 var url = "<c:url value='/JsonServlet2'/>"; //3設置訪問方式 xhr.open("POST", url, true); //4設置訪問成功返回後的操作 xhr.onreadystatechange = function() { if (xhr.readyState == 4) {//返回 if (xhr.status == 200) {//響應代碼正常 //※※※※※解析後台返回的json串 //js中eval()方法的功能:是校驗參數文本串符合js中哪一種數據類型,並把其轉換成對應類型的對象 var txt = xhr.responseText; //alert(txt); //把符合json格式的文本串 轉換成 json對象 var users = eval("(" + txt + ")"); for ( var key in users)//map的便利方式 alert("屬性:" + key + ",值:" + users[key]); } //for ( var i = 0; i < users.length; i++) {//list的遍歷方式 //alert(users[i].id +","+users[i].name+","+users[i].age); //} }; }; //5 發送 xhr.send(null); } </script> </head> <body> <input type="button" onclick="ask1();" value="ajax請求後台數據(手動封裝json方式)" /> <br /> <input type="button" onclick="ask2();" value="ajax請求後台數據(用apache工具封裝json方式)" /> <input type="button" onclick="ask3()" value="ajax請求後台數據(用fastjson工具封裝json方式)" /> </body> </html>
JsonServlet1.java
package cn.hncu.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import cn.hncu.domain.User; public class JsonServlet1 extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //調用後台service.dao.query(),到數據庫當中把信息讀取出來 //為簡化知識點的理解,此處後台部分的功能直接模擬 response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); List<User> users = new ArrayList<User>(); users.add(new User("A001","Jack",20)); users.add(new User("A002","Rose",22)); users.add(new User("B001","張三",20)); users.add(new User("B002","李四",30)); String json=""; //用java封裝出json格式的字符串:[{name:"Jack",age:25}, {...}, {...} ] for(User u:users){ if(json.equals("")){ json="{name:\""+u.getName()+"\",id:\""+u.getId()+"\",age:"+u.getAge()+"}"; }else{ json = json +",{ name:\""+u.getName()+"\",id:\""+u.getId()+"\",age:"+u.getAge()+"}" ; } } json="["+json+"]"; out.print(json); } }
JsonServlet2.java
package cn.hncu.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import cn.hncu.domain.User; import net.sf.json.JSONArray; import net.sf.json.JSONObject; public class JsonServlet2 extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); List<User> users = new ArrayList<User>(); users.add(new User("A001","Jack",20)); users.add(new User("A002","Rose",22)); users.add(new User("B001","張三",20)); users.add(new User("B002","李四",30)); String strJson=com.alibaba.fastjson.JSONArray.toJSONString(users); System.out.println(strJson); //用fastjson工具(只有一個jar包)幫我們把list轉換成json串 Map<String, Object> map = new HashMap<String, Object>(); map.put("addr", "湖南"); map.put("height", "170"); map.put("marry", "no"); map.put("user", new User("A003","小李",25)); String strMap=com.alibaba.fastjson.JSONArray.toJSONString(map); out.print(strMap.toString()); } }
JsonServlet3.java
package cn.hncu.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import cn.hncu.domain.User; public class JsonServlet3 extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); List<User> users = new ArrayList<User>(); users.add(new User("A001","Jack",20)); users.add(new User("A002","Rose",22)); users.add(new User("B001","張三",20)); users.add(new User("B002","李四",30)); //用fastjson工具(只有一個jar包)幫我們把list轉換成json串 JSONArray json=JSONArray.fromObject(users); String strJson=json.toString(); System.out.println(strJson); Map<String, Object> map = new HashMap<String, Object>(); map.put("addr", "湖南"); map.put("height", "170"); map.put("marry", "no"); map.put("user", new User("A003","小李",25)); JSONObject obj = JSONObject.fromObject(map); System.out.println(obj.toString()); out.print(obj.toString()); } }
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