com.aliyun.openservices.shade.com.alibaba.fastjson.JSONException: exepct '[', but {, pos 1, line 1, column 2

报错原因：你放的是一个非List的对象 却想取一个List对象出来

package test;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import com.alibaba.fastjson.JSON;

import com.alibaba.fastjson.JSONArray;

public class VarTest {

    public static void main(String[] args) {

        LiuJieTestObj obj = new LiuJieTestObj();

        obj.setId(111L);

        Date date1 = new Date(2019, 7, 23);

        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        df.format(date1);

        obj.setTestDate(date1);

        // 错误示范1 报错：Exception in thread "main" com.alibaba.fastjson.JSONException: expect '[', but {, pos 1, line1,column 2

        String str1 = JSON.toJSONString(obj);// 放进去的不是List

        System.out.println("str1:"+str1);//str1:{"id":111,"testDate":61524633600000}

        List<LiuJieTestObj> objList1 = JSON.parseArray(str1, LiuJieTestObj.class);// 取一个List

        // 错误示范2 报错：Exception in thread "main" com.alibaba.fastjson.JSONException: expect '[', but {, pos 1, line1,column 2

        String str2 = JSONArray.toJSONString(obj);// 放进去的是非List的对象

        System.out.println("str2:"+str2);//str2:{"id":111,"testDate":61524633600000}

        List<LiuJieTestObj> objList2 = JSON.parseArray(str2, LiuJieTestObj.class);// 取一个List

        // 正确示范3

        List<LiuJieTestObj> list = new ArrayList<>();

        list.add(obj);

        String str3 = JSON.toJSONString(list);// 放进去的是List

        System.out.println("str3:"+str3);//str3:[{"id":111,"testDate":61524633600000}]

        List<LiuJieTestObj> objList3 = JSON.parseArray(str3, LiuJieTestObj.class);// 取一个List

    }

}

package test;

import java.util.Date;

public class LiuJieTestObj {

    private Long id ;

    private Date testDate;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public Date getTestDate() {

        return testDate;

    }

    public void setTestDate(Date testDate) {

        this.testDate = testDate;

    }

}