Ajax请求action并返回参数

蔚落 2022-06-06 12:46 208阅读 0赞

### 下面匙一个检测邮箱是否被占用的例子 ###

#### 前台js ####

$.ajax({
                    type: "post",
                    url: "checkEmail.action",
                    data: {
                        email: email
                    },
                    dataType: "text",
                    success: function (da) { 
                        console.log(da);
                        if (da == '1') {
                            $("#emailinfo").empty();
                            $("#emailinfo").text("电子邮件地址可用");
                        }
                        if (da == '0'){
                            $("#emailinfo").text("抱歉，邮件地址已经被使用");
                        }
                    },
                    error: function () { 
                        console.log("请求失败")
                    }
                })

**注意：dataType的类型，写错会得不到返回的值**

#### action ####

/** * 查找邮箱是否被使用 * * @return */
        public void checkEmail() {
            HttpServletResponse response = ServletActionContext.getResponse();
            response.setCharacterEncoding("UTF-8");
    
            boolean b = userService.checkEmail(email);
            System.out.println(checkEmail);
            if (b == true) {
                checkEmail = 1;
                try {
                    response.getWriter().write(checkEmail+"");//可以注册
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }else {
                checkEmail = 0;
                try {
                    response.getWriter().write(checkEmail+"");//不能注册
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
    
        }

\*\*注意：`HttpServletResponse response = ServletActionContext.getResponse(); response.setCharacterEncoding("UTF-8"); response.getWriter().write(checkEmail+"");`\*\*

#### struts.xml ####

**错误：ajax回调函数输出整个页面**  
**解决：原因是struts.xml里面返回了jsp页面。action设置为无返回值就ok了**