java responsebody_SpringBoot ResponseBody返回值处理的实现「建议收藏」

1. springboot responsebody 返回值中null值处理

@postmapping(path = “/test”, produces = mediatype.application_json_value)

public object test() {

jsonobject jsonobject = new jsonobject();

jsonobject.put(“test”,”test”);

jsonobject.put(“testnull”,null);

apiresponsevo apiresponsevo = new apiresponsevo();

apiresponsevo.setdata(jsonobject );

apiresponsevo.setstatus(0);

return apiresponsevo;

}

接口返回 (想实现将testnull也进行返回) :

{

“data”: {

“test”: “test”

},

“status”: 0

}

import java.nio.charset.charset;

import java.util.arraylist;

import java.util.list;

import org.springframework.context.annotation.configuration;

import org.springframework.http.mediatype;

import org.springframework.http.converter.httpmessageconverter;

import org.springframework.web.servlet.config.annotation.webmvcconfigurationsupport;

import com.alibaba.fastjson.serializer.serializerfeature;

import com.alibaba.fastjson.support.config.fastjsonconfig;

import com.alibaba.fastjson.support.spring.fastjsonhttpmessageconverter;

@configuration

public class fastjsonconfig extends webmvcconfigurationsupport {

@override

public void configuremessageconverters(list> converters) {

fastjsonhttpmessageconverter converter = new fastjsonhttpmessageconverter();

fastjsonconfig config = new fastjsonconfig();

config.setserializerfeatures(

// 保留 map 空的字段

serializerfeature.writemapnullvalue,

// 将 string 类型的 null 转成””

// serializerfeature.writenullstringasempty,

// 将 number 类型的 null 转成 0

// serializerfeature.writenullnumberaszero,

// 将 list 类型的 null 转成 []

// serializerfeature.writenulllistasempty,

// 将 boolean 类型的 null 转成 false

// serializerfeature.writenullbooleanasfalse,

// 避免循环引用

serializerfeature.disablecircularreferencedetect

);

converter.setfastjsonconfig(config);

converter.setdefaultcharset(charset.forname(“utf-8”));

list mediatypelist = new arraylist<>();

// 解决中文乱码问题，相当于在 controller 上的 @requestmapping 中加了个属性 produces = “application/json”

mediatypelist.add(mediatype.application_json);

converter.setsupportedmediatypes(mediatypelist);

converters.add(converter);

}

}

2. 拦截responsebody转json,对数据进行二次处理 (字典转换做案例)

2.1> 设置拦截器

import java.nio.charset.standardcharsets;

import java.util.list;

import org.springframework.context.annotation.bean;

import org.springframework.context.annotation.configuration;

import org.springframework.http.converter.httpmessageconverter;

import org.springframework.http.converter.stringhttpmessageconverter;

import org.springframework.web.servlet.config.annotation.interceptorregistry;

import org.springframework.web.servlet.config.annotation.webmvcconfigurer;

import com.alibaba.fastjson.serializer.serializerfeature;

import com.alibaba.fastjson.support.config.fastjsonconfig;

import com.alibaba.fastjson.support.spring.fastjsonhttpmessageconverter;

import com.fintell.dp3.manager.interceptor.loginterceptor;

@configuration

public class webmvcconfiguration implements webmvcconfigurer {

@override

public void addinterceptors(interceptorregistry registry) {

// 自定义拦截器，添加拦截路径和排除拦截路径

registry.addinterceptor(getloginterceptor()).addpathpatterns(“/**”);

}

@bean

public loginterceptor getloginterceptor() {

return new loginterceptor();

}

/**

* 修改stringhttpmessageconverter默认配置 & json 默认序列化方式 (改这个方法)

*/

@override

public void configuremessageconverters(list> converters) {

//创建fastjson消息转换器

fastjsonhttpmessageconverter fastconverter = new fastjsonhttpmessageconverter();

//创建配置类

fastjsonconfig fastjsonconfig = new fastjsonconfig();

//修改配置返回内容的过滤

fastjsonconfig.setserializerfeatures(

serializerfeature.disablecircularreferencedetect,

serializerfeature.writemapnullvalue,

serializerfeature.writenullstringasempty

);

fastconverter.setfastjsonconfig(fastjsonconfig);

//将fastjson添加到视图消息转换器列表内

converters.add(fastconverter);

}

}

2.2> 字典注解类

import java.lang.annotation.elementtype;

import java.lang.annotation.retention;

import java.lang.annotation.retentionpolicy;

import java.lang.annotation.target;

@target({elementtype.field})

@retention(retentionpolicy.runtime)

public @interface dict {

string type();

}

2.3> 序列化类

import java.io.ioexception;

import java.lang.reflect.field;

import org.apache.commons.lang3.stringutils;

import org.springframework.context.annotation.configuration;

import com.fasterxml.jackson.core.jsongenerator;

import com.fasterxml.jackson.databind.jsonserializer;

import com.fasterxml.jackson.databind.objectmapper;

import com.fasterxml.jackson.databind.serializerprovider;

import lombok.extern.slf4j.slf4j;

@slf4j

@configuration

public class dictjsonserializer extends jsonserializer {

@override

public void serialize(object dictval, jsongenerator generator, serializerprovider provider) throws ioexception {

objectmapper objectmapper = new objectmapper();

string currentname = generator.getoutputcontext().getcurrentname();

try {

// 1> 获取字段

field field = generator.getcurrentvalue().getclass().getdeclaredfield(currentname);

// 2> 获取字典注解

dict dict = field.getdeclaredannotation(dict.class);

// 3> 判断是否添加了字典注解

if(dict == null) {

objectmapper.writevalue(generator, dictval);

return;

}

// 4> 获取注解的type值

string type = dict.type();

// **************** 以下依据实际业务处理即可 ********************

// 5> 获取到字段的值

string val = dictval == null ? “” : dictval.tostring();

string dictvalname = “”;

if(!stringutils.isempty(val)) {

// 6> 这里可以依据type做不同的处理逻辑

dictvalname = “通过自己的方法,依据val获取到对应的字典值”;

}

// 7> 将字段改写为{“code”:”code”,”name”:”name”}格式

objectmapper.writevalue(generator, baseenum.builder().code(dictval).name(dictvalname.tostring()).build());

} catch (nosuchfieldexception e) {

log.error(e);

}

}

}

2.4> 字典注解使用

@suppresswarnings(“serial”)

@builder

@getter

@setter

@tostring

@noargsconstructor

@allargsconstructor

public class bizruledto implements serializable{

// 指定使用哪种序列化

@jsonserialize(using = dictjsonserializer.class)

// 指定字典 (将被转换为{“code”:”content”,”name”:”contentname”}格式)

@dict(type = “content”)

private string content;

}

3. 其它补充 (从容器中获取某个实例) : 如 dictjsonserializer 需要通过service查询数据库获取字典

@slf4j

public class dictjsonserializer extends jsonserializer {

// service

private static productproxy productproxy;

static {

productproxy = springutils.getbean(productproxy.class);

}

@override

public void serialize(object dictval, jsongenerator generator, serializerprovider provider) throws ioexception {

}

}

springutils

import org.springframework.beans.beansexception;

import org.springframework.context.applicationcontext;

import org.springframework.context.applicationcontextaware;

import org.springframework.stereotype.component;

@component

public class springutils implements applicationcontextaware {

private static applicationcontext ctx;

/**

* 获取bean

*/

@suppresswarnings(“unchecked”)

public static t getbean(string id) {

return (t) ctx.getbean(id);

}

/**

* 按类型获取bean

*/

public static t getbean(class clazz) {

return ctx.getbean(clazz);

}

@override

public void setapplicationcontext(applicationcontext applicationcontext) throws beansexception {

ctx = applicationcontext;

}

}

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