封装springmvc处理ajax请求结果

原文链接：http://blog.csdn.net/qq_37936542/article/details/79064818

需求描述：ajax向后台发起请求，springmvc在处理完请求后返回的结果类型不能够统一，int/String/Map/List等等，这里我自定义一个类，封装返回结果

一：封装主类 AjaxResponse

package com.debo.common;

import java.util.HashMap;
import java.util.Map;

public class AjaxResponse {

    private ReturnState returnState;

    private String returnMsg;

    private Map<String, Object> returnData = new HashMap<String, Object>();

    public AjaxResponse() {
        this(ReturnState.OK, "");
    }

    public AjaxResponse(String returnMsg) {
        this(ReturnState.OK, returnMsg);
    }

    public AjaxResponse(ReturnState returnState, String returnMsg) {
        this.returnState = returnState;
        this.returnMsg = returnMsg;
    }

    public AjaxResponse(String attributeName, Object attributeValue) {
        this();
        addAttribute(attributeName, attributeValue);
    }

    public static AjaxResponse getInstanceByResult(boolean result) {
        if (result) {
            return new AjaxResponse(Constant.OPERATE_SUCCESS);
        } else {
            return new AjaxResponse(ReturnState.ERROR, Constant.OPERATE_ERROR);
        }
    }

    public ReturnState getReturnState() {
        return returnState;
    }

    public void setReturnState(ReturnState returnState) {
        this.returnState = returnState;
    }

    public String getReturnMsg() {
        return returnMsg;
    }

    public void setReturnMsg(String returnMsg) {
        this.returnMsg = returnMsg;
    }

    public Map<String, Object> getReturnData() {
        if (returnData == null) {
            returnData = new HashMap<String, Object>();
        }
        return returnData;
    }

    public void setReturnData(Map<String, Object> returnData) {
        this.returnData = returnData;
    }

    public AjaxResponse addAttribute(String attributeName, Object attributeValue) {
        getReturnData().put(attributeName, attributeValue);
        return this;
    }
}

二：返回状态枚举 ReturnState

package com.debo.common;

/**
 * Ajax返回状态
 *
 * @author lzg
 */
public enum ReturnState {
    OK,
    WARNING,
    ERROR
}

三：系统常用常量 Constant

package com.debo.common;


public class Constant {
    public static final int ZERO = 0;
    public static final String SUCCESS = "success";
    public static final String ERROR = "error";
    public static final String OPERATE_SUCCESS = "操作成功！";
    public static final String OPERATE_ERROR = "操作失败！";
    public static final String NOT_PERMITTED = "权限不足！";
    public static final String STATE1 = "1";
    public static final String STATE2 = "2";
    public static final int AFFECTED_LINE_0 = 0;
    public static final int AFFECTED_LINE_1 = 1;
}

四：后台测试代码

package com.debo.common;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class Test {

    @RequestMapping("/test")
    @ResponseBody
    public AjaxResponse demo(){

        //操作正确时，返回正确信息
        //return new AjaxResponse(ReturnState.OK,"操作成功");
        //return new AjaxResponse("操作成功");
        //return AjaxResponse.getInstanceByResult(true);

        //操作失败，返回失败信息
        //return new AjaxResponse(ReturnState.ERROR,"登录名已存在");
        //return AjaxResponse.getInstanceByResult(false);

        //返回一个对象、集合或map
        //return new AjaxResponse("returnDate", map/List/对象);

        //返回多个对象、map、集合
        //AjaxResponse ajaxResponse = new AjaxResponse();
        //ajaxResponse.addAttribute("aaa", map);
        //ajaxResponse.addAttribute("bbb", list);
        //ajaxResponse.addAttribute("ccc", 对象);

        //默认操作成功，无返回信息
        return new AjaxResponse();
    }
}

五：前端ajax代码

$.ajax({
    url : "test",
    type : "get",
    dataType : "json",
    success : function(data) {
        //返回状态
        //alert(data.returnState);
        //返回信息
        //alert(data.returnMsg)
        //返回的对象/集合/map
        alert(data.returnData.aaa)
        }
});

文末福利：

福利一：前端，Java，产品经理，微信小程序，Python等8G资源合集大放送：https://www.jianshu.com/p/e8197d4d9880

福利二：微信小程序入门与实战全套详细视频教程

领取方式：
如果需要学习视频，欢迎关注 【编程微刊】微信公众号，回复【领取资源】一键领取以下所有干货资源，获取更多有用技术干货、文档资料。所有文档会持续更新，欢迎关注一起成长！