【javaWeb】前后端传递数据交互的两种方式

一、使用struct2的方法set及get

<form id="formid"  name= "myform" method = 'post'  action = 'login.action' onsubmit = "return checkUser();" >
<table width="100%" border="0">
<tr>
<td width="60" height="40" align="right">用户名 </td>
<td><input type="text" value="" class="text2" name = "username" id = "userid"/></td>
</tr>
<tr>
<td width="60" height="40" align="right">密  码 </td>
<td><input type="password" value="" class="text2" name = "password" id = "userpassid"/></td>
</tr>
<tr>
<td width="60" height="40" align="right"> </td>
<td><div class="c4">
<input type="submit" value="" class="btn2"  /></div>
</td>

</tr>
</table>

</form>

function checkUser(){
var result = document.getElementById("userid").value;
var password = document.getElementById("userpassid").value;
if(result == ""  ){
alert("用户名不能为空");
return false;
}
if(password == ""  ){
alert("密码不能为空");
return false;
}else{
return true;
}
}

<action name="login" method="login" class="com.simpleton.demo.action.JsonAction">
</action>

private String username;

private String password;

public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}

publi
4000
c void login(){
System.out.println(username);
System.out.println(password);
}

二、使用ajax传递数据

$.ajax({
type:"post",
url:"addwordJsonAction",//请求的action
data:{word : word},//传递的数据
dataType:"json",//设置需要返回的数据类型
success:function(data){
//成功时返回的数据
}
});

<action name="*JsonAction" method="{1}" class="com.simpleton.demo.action.JsonAction">
<!-- 返回json类型数据 -->
<result type="json">
<param name="root">result</param>
</result>
</action>

HttpServletRequest request = ServletActionContext.getRequest();
String word = request.getParameter("word");
System.out.println(word);