封裝springmvc處理ajax請求結果

原文連結：http://blog.csdn.net/qq_37936542/article/details/79064818

需求描述：ajax向後臺發起請求，springmvc在處理完請求後返回的結果型別不能夠統一，int/String/Map/List等等，這裡我自定義一個類，封裝返回結果

一：封裝主類 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：返回狀態列舉 ReturnState

package com.debo.common;

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

三：系統常用常量 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 = "操作失敗！";
    public static final String NOT_PERMITTED = "許可權不足！";
    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：後臺測試程式碼

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(){

        //操作正確時，返回正確資訊
        //return new AjaxResponse(ReturnState.OK,"操作成功");
        //return new AjaxResponse("操作成功");
        //return AjaxResponse.getInstanceByResult(true);

        //操作失敗，返回失敗資訊
        //return new AjaxResponse(ReturnState.ERROR,"登入名已存在");
        //return AjaxResponse.getInstanceByResult(false);

        //返回一個物件、集合或map
        //return new AjaxResponse("returnDate", map/List/物件);

        //返回多個物件、map、集合
        //AjaxResponse ajaxResponse = new AjaxResponse();
        //ajaxResponse.addAttribute("aaa", map);
        //ajaxResponse.addAttribute("bbb", list);
        //ajaxResponse.addAttribute("ccc", 物件);

        //預設操作成功，無返回資訊
        return new AjaxResponse();
    }
}

五：前端ajax程式碼

$.ajax({
    url : "test",
    type : "get",
    dataType : "json",
    success : function(data) {
        //返回狀態
        //alert(data.returnState);
        //返回資訊
        //alert(data.returnMsg)
        //返回的物件/集合/map
        alert(data.returnData.aaa)
        }
});

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