用jQuery ajax时,后台无法获取前台传来的json数组,急,急,急!!!
代码如下: 望高手指点或提供一个用jQuery ajax传json数组后台解析的例子,在此感谢不尽。前台js:$(function(){
$("#btnOk").click(function(){
$.post("link.do?operate=parse", "[ {name:'a', gender:'男'}, {name:'b', gender:'女'} ]");
})
}); 后台:
StringBuffer jsondata = new StringBuffer();
System.out.println("json数组解析开始了!!!"); String line = null;
while ((line = request.getReader().readLine()) != null) {
jsondata.append(message);
}
System.out.println("接收到的json数据:"+ jsondata.toString());
JSONArray array = new JSONArray(jsondata);
for(int i = 0; i < array.length(); i++) {
JSONObject json = (JSONObject) array.get(i);
System.out.println(json.getString("name")+ ","+ json.getString("gender"));
}
输出:
信息: Initialize action of type: com.json.struts.action.LinkAction
json数组解析开始了
接收到的json数据:
2010-3-2 21:27:22 org.apache.struts.chain.commands.AbstractExceptionHandler execute
警告: Unhandled exception
java.lang.NullPointerException
at java.io.StringReader.<init>(StringReader.java:33)
at org.json.JSONTokener.<init>(JSONTokener.java:66)
at org.json.JSONArray.<init>(JSONArray.java:157)
at com.json.struts.action.LinkAction.parsejson(LinkAction.java:88)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170)
at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
代码如下: 望高手指点或提供一个用jQuery ajax传json数组后台解析的例子,在此感谢不尽。前台js:$(function(){
$("#btnOk").click(function(){
$.post("link.do?operate=parse", "[ {name:'a', gender:'男'}, {name:'b', gender:'女'} ]");
})
}); 后台:
StringBuffer jsondata = new StringBuffer();
System.out.println("json数组解析开始了!!!"); String line = null;
while ((line = request.getReader().readLine()) != null) {
jsondata.append(message);
}
System.out.println("接收到的json数据:"+ jsondata.toString());
JSONArray array = new JSONArray(jsondata);
for(int i = 0; i < array.length(); i++) {
JSONObject json = (JSONObject) array.get(i);
System.out.println(json.getString("name")+ ","+ json.getString("gender"));
}
输出:
信息: Initialize action of type: com.json.struts.action.LinkAction
json数组解析开始了
接收到的json数据:
2010-3-2 21:27:22 org.apache.struts.chain.commands.AbstractExceptionHandler execute
警告: Unhandled exception
java.lang.NullPointerException
at java.io.StringReader.<init>(StringReader.java:33)
at org.json.JSONTokener.<init>(JSONTokener.java:66)
at org.json.JSONArray.<init>(JSONArray.java:157)
at com.json.struts.action.LinkAction.parsejson(LinkAction.java:88)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:269)
at org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:170)
at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
var json = {"options":"[{\"text\":\"王家湾\",\"value\":\"9\"},{\"text\":\"李家湾\",\"value\":\"10\"},{\"text\":\"邵家湾\",\"value\":\"13\"}]"}
json = eval(json.options)
for(var i=0; i<json.length; i++)
{
alert(json[i].text+" " + json[i].value)
}
</script>
function showIndicator(){
$.getJSON("IndicatorManager.jsp", //服务器页面地址
{
action: "getIndicatorList" //action参数
},
function(json) { //回调函数
$(json).each(function(i){ //遍历结果数组
alert(json[i].indicatorCode);
alert(json[i].indicatorName);
});
}
);
} 服务器段代码: String getIndicatorList(String userLoginId) {
JSONArray array = new JSONArray(); //定义JSON数组
String sql = "select INDICATORCODE,trim(INDICATORNAME) as INDICATORNAME,STATUS from modelindicator where UserLoginId=? order by INDICATORCODE asc";//定义SQL语句
Connection conn = null; //声明Connection对象
PreparedStatement pstmt = null; //声明PreparedStatement对象
ResultSet rs = null; //声明ResultSet对象
try {
conn = DBUtils.getConnection(); //获取数据库连接
pstmt = conn.prepareStatement(sql); //根据sql创建PreparedStatement
pstmt.setString(1,userLoginId);
rs = pstmt.executeQuery(); //执行查询,返回结果集
while (rs.next()) {
JSONObject obj = new JSONObject();
obj.put("indicatorCode", rs.getString(1));
obj.put("indicatorName", rs.getString(2));
obj.put("status", rs.getString(3));
array.add(obj);
}
} catch (SQLException e) {
System.out.println(e.toString());
} finally {
DBUtils.close(rs); //关闭结果集
DBUtils.close(pstmt); //关闭PreparedStatement
DBUtils.close(conn); //关闭连接
}
return array.toString();
}
你的用法好像有问题。
把引号去了,这样看看
struts2+jQuery+formValidator注册时ajax验证用户名和邮箱问题
http://www.phome.asia/forum/thread/22019.html
然后再传给后台。。