大佬教程收集整理的这篇文章主要介绍了html5 mui之ajax跨域请求json数据，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
通过json发送和接受数据，数据以json的格式在服务器端和前台进行传递，什么是json数据？这里就不进行详细阐述，轻自行百度@L_874_2@。
在html5 中利用ajax 异步请求时，会遇到跨域的问题，如果域名不一致、ip地址不一致，端口不一致都会导致跨域请求不成功。
为了@L_874_2@这个问题，需要在前台和后台均设置相关的属性进行跨域请求。
现在展示服务器端的代码：
自己封装的过滤器：
package utils; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.Servletrequest; import javax.servlet.ServletResponse; import javax.servlet.http.httpServletResponse; public class CrossDomainFilter implements Filter { public void destroy() { // TODO Auto-generated method stub } public void doFilter(Servletrequest req,ServletResponse resp,FilterChain chain) throws IOException,ServletException { // TODO Auto-generated method stub httpServletResponse res = (httpServletResponsE) resp; // 这里最好不要写通配符，如果允许多个域请求数据的话，可以直接用逗号隔开："http://www.baidu.com,http://google.com" res.setHeader("Access-Control-Allow-Origin","*"); res.setHeader("Access-Control-Allow-Methods","POST,GET,OPTIONS"); res.setHeader("Access-Control-Allow-Headers","Content-Type,Authorization,Accept,X-requested-With"); //res.setHeader("Access-Control-Allow-Credentials","false"); chain.doFilter(req,resp); } public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub } }
将字符串转换为json数据格式的工具类：
package utils; import java.beans.IntrospectionException; import java.beans.Introspector; import java.beans.PropertyDescriptor; import java.math.bigdecimal; import java.math.bigInteger; import java.util.List; import java.util.Map; import java.util.Set; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class JsonUtil { private static Log log = LogFactory.getLog(JsonUtil.class); public static String object2json(Object obj) { StringBuilder json = new StringBuilder(); if (obj == null) { json.append("\"\""); } else if (obj instanceof String || obj instanceof Integer || obj instanceof Float || obj instanceof Boolean || obj instanceof Short || obj instanceof Double || obj instanceof Long || obj instanceof Bigdecimal || obj instanceof BigInteger || obj instanceof BytE) { json.append("\"").append(String2json(obj.toString())).append("\""); } else if (obj instanceof Object[]) { json.append(array2json((Object[]) obj)); } else if (obj instanceof List) { json.append(list2json((List<?>) obj)); } else if (obj instanceof Map) { json.append(map2json((Map<?,?>) obj)); } else if (obj instanceof Set) { json.append(set2json((Set<?>) obj)); } else { json.append(bean2json(obj)); } return json.toString(); } public static String bean2json(Object bean) { StringBuilder json = new StringBuilder(); json.append("{"); PropertyDescriptor[] props = null; try { props = Introspector.getBeanInfo(bean.getClass(),Object.class).getPropertyDescriptors(); } catch (IntrospectionException E) {} if (props != null) { for (int i = 0; i < props.length; i++) { try { String name = object2json(props[i].getName()); String value = object2json(props[i].getReadMethod().invoke(bean)); json.append(Name); json.append(":"); json.append(value); json.append(","); } catch (Exception E) {} } json.setCharAt(json.length() - 1,'}'); } else { json.append("}"); } return json.toString(); } public static String list2json(List<?> list) { StringBuilder json = new StringBuilder(); json.append("["); if (list != null && list.size() > 0) { for (Object obj : list) { json.append(object2json(obj)); json.append(","); } json.setCharAt(json.length() - 1,']'); } else { json.append("]"); } return json.toString(); } public static String array2json(Object[] array) { StringBuilder json = new StringBuilder(); json.append("["); if (array != null && array.length > 0) { for (Object obj : array) { json.append(object2json(obj)); json.append(",']'); } else { json.append("]"); } return json.toString(); } public static String map2json(Map<?,?> map) { StringBuilder json = new StringBuilder(); json.append("{"); if (map != null && map.size() > 0) { for (Object key : map.keySet()) { json.append(object2json(key)); json.append(":"); json.append(object2json(map.get(key))); json.append(",'}'); } else { json.append("}"); } return json.toString(); } public static String set2json(Set<?> set) { StringBuilder json = new StringBuilder(); json.append("["); if (set != null && set.size() > 0) { for (Object obj : set) { json.append(object2json(obj)); json.append(",']'); } else { json.append("]"); } return json.toString(); } public static String String2json(String s) { if (s == null) return ""; StringBuilder sb = new StringBuilder(); for (int i = 0; i < s.length(); i++) { char ch = s.charAt(i); switch (ch) { case '"': sb.append("\\\""); break; case '\\': sb.append("\\\\"); break; case '\b': sb.append("\\b"); break; case '\f': sb.append("\\f"); break; case '\n': sb.append("\\n"); break; case '\r': sb.append("\\r"); break; case '\t': sb.append("\\t"); break; case '/': sb.append("\\/"); break; default: if (ch >= '\u0000' && ch <= '\u001F') { String ss = Integer.toHexString(ch); sb.append("\\u"); for (int k = 0; k < 4 - ss.length(); k++) { sb.append('0'); } sb.append(ss.toUpperCase()); } else { sb.append(ch); } } } return sb.toString(); } }
web.xml配置文件：
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLscheR_946_11845@a-instance" xsi:scheR_946_11845@aLOCATIOn="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name></display-name> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>showInfoServlet</servlet-name> <servlet-class>client_servlet.showInfoServlet</servlet-class> </servlet> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>JsonServlet</servlet-name> <servlet-class>client_servlet.JsonServlet</servlet-class> </servlet> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>ajaxServlet</servlet-name> <servlet-class>client_servlet.ajaxServlet</servlet-class> </servlet> <filter> <filter-name>myFilter</filter-name> <filter-class>utils.CrossDomainFilter</filter-class> </filter> <filter-mapping> <filter-name>myFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet-mapping> <servlet-name>showInfoServlet</servlet-name> <url-pattern>/servlet/showInfoServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>JsonServlet</servlet-name> <url-pattern>/servlet/JsonServlet</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>ajaxServlet</servlet-name> <url-pattern>/servlet/ajaxServlet</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
用于处理业务逻辑的servlet:
package client_servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.List; import javabean.Route; import javax.servlet.ServletException; import javax.servlet.http.httpServlet; import javax.servlet.http.httpServletrequest; import javax.servlet.http.httpServletResponse; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import services.Routeservice; import utils.JsonUtil; public class showInfoServlet extends httpServlet { public void doGet(httpServletrequest request,httpServletResponse responsE) throws ServletException,IOException { dopost(request,responsE); } public void dopost(httpServletrequest request,IOException { response.setHeader("Access-Control-Allow-Origin","*"); response.setContentType("text/html; charset=UTF-8");//jsonp其实回写的就是一段JavaScript代码 PrintWriter out = response.getWriter(); //从数据库查询所有的路线route的集合list Routeservice rs = new Routeservice(); String res = JsonUtil.list2json(rs.listAll()); out.print(res); out.flush(); out.close(); } }
通过hbuilder建立的demo.html文件：
该文件用于请求后台的servlet并且接受服务器端返回的json数据
<!DOCTYPE html> <html> <head> <Meta charset="UTF-8"> <Meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,user-scalable=no" /> <title>Hello world</title> <script src="js/mui.min.js"></script> <link href="css/mui.min.css" rel="stylesheet" /> <script type="text/javascript"> if(window.plus) { plusReady(); } else { document.addEventListener("plusready",plusReady(),falsE); } function plusReady() { } //创建一个新的页面 function createNewWeb() { var url = "http://www.jiangbobobo.cn/smart"; plus.webview.create(url).show(); } //发送数据的函数 function postData(url,data,callBACk) { mui.ajax(url,{ data: 'data=' + JSON.Stringify(data),dataType: 'json',type: 'get',contentType: "application/x-www-form-urlencoded; charset=utf-8",timeout: 6000000,success: callBACk,error: function(xhr,type,errorThrown) { //waiTingDialog.close(); mui.alert("<网络连接失败，请重新尝试一下>","错误","OK",null); console.log(typE); console.log(JSON.Stringify(xhr)); } }); } function @L_772_25@ { var data = {}; postData('http://192.168.17.1:8080/zAnnadu/servlet/showInfoServlet',// json 数据 function(json) { //mui.alert("Hello"); var html = ""; var x = document.getElementById("mycard"); //mui.alert(str); for(var i = 0; i < json.length; i++) { //mui.alert(json[i].imageURL); html += "<div class='mui-card'>"; html += "<div class='mui-card-header mui-card-media' style='height:40vw;BACkground-image:url(" + json[i].imageURL + ")'></div>"; html += "<div class='mui-card-content'>"; html += "<div class='mui-card-content-inner'>"; html += "<div class='mui-content'>"; html += "<h4>" + json[i].name + "</h4>"; html += "<p id='route_description'>"; html += "" + json[i].service_content + ""; html += "</p>"; html += "</div>"; html += "</div>"; html += "</div>"; html += "<div class='mui-card-footer'>"; html += "<a class='mui-card-link'>" + json[i].like_number + "</a>"; html += "<a class='mui-card-link'>" + json[i].old_price + "</a>"; html += "<a class='mui-card-link'>" + json[i].new_price + "</a>"; html += "</div>"; html += "</div>"; x.innerHTML = html; } } ); } </script> </head> <body onload="@L_772_25@"> <!--<button onclick="createNewWeb()">show data</button>--> <!--<input type="button" value="test" onclick="@L_772_25@" />--> <div class="mui-content" id="mycard"> </div> </body> </html>
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