一、描述錯誤

當我在讀取自定義配置文件信息時，希望返回到前臺(以json的格式),但是報錯。

錯誤信息大致如下(未完全粘貼)：

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class org.springframework.context.expression.StandardBeanExpressionResolver

二、大致情況

就是後臺返回的數據不能正確被序列化

三、看代碼

resource.properties

######################################
##########   存儲配置相關的信息         ########## 
######################################
com.xf.name
 
=陳獨秀
com.xf.age=21
com.xf.gender=男
com.xf.school=家裏蹲大學
com.xf.address=裏根

映射實體類：

package com.xf.database.entity;


import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
 
/*
 * 讀取自定義配置文件信息
 * 當在自定義配置文件存儲中文時，讀取文件信息的
 * @PropertySource(value="classpath:config/resource.properties",
encoding="UTF-8")
 *  需要指定編碼encoding="UTF-8" 才不會顯示亂碼
 * 
 */
@Configuration
@ConfigurationProperties(prefix="com.xf") //指定前綴
@PropertySource(value="classpath:config/resource.properties",
encoding="UTF-8")
 
public class CResource{
    /**
     * 
     */
    private String name; // 姓名
    private Integer age; // 年齡
    private String school; // 學校
    private String address; // 地址
    private String gender; // 性別
    
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getAge() {
        return age;
    }
    public void setAge(Integer age) {
        this.age = age;
    }
    public String getSchool() {
        return school;
    }
    public void setSchool(String school) {
        this.school = school;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    @Override
    public String toString() {
        return "Resource [name=" + name + ", age=" + age + ", school=" + school + ", address=" + address + ", gender="
                + gender + "]";
    }
    
}

讀取配置文件：

package com.xf.controllers;


import javax.annotation.Resource;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.xf.database.entity.CResource;

@RestController
public class ReadConfigurationController {
    @Resource
    private CResource resource;
    
    @RequestMapping("/getresource")
    public String getResource() throws JsonProcessingException{
        ObjectMapper mapper = new ObjectMapper();
//        CResource c = new CResource();
//        c.setName(resource.getName());
//        c.setAge(resource.getAge());;
//        c.setAddress(resource.getAddress());
//        c.setSchool(resource.getSchool());
//        c.setGender(resource.getGender());
//        return mapper.writeValueAsString(c);
        return mapper.writeValueAsString(resource);
    }
}

若取消掉註釋部分，，，那麽就會最開始的那個報錯。。

四、解決辦法

重新實例化一個對象實例，並且把獲取的值重新賦值，並以json的格式返回

ObjectMapper mapper = new ObjectMapper();
CResource c = new CResource();
c.setName(resource.getName());
c.setAge(resource.getAge());;
c.setAddress(resource.getAddress());
c.setSchool(resource.getSchool());
c.setGender(resource.getGender());
return mapper.writeValueAsString(c);

SpringBoot讀取配置文件信息顯示報錯