{"id":9934,"date":"2023-03-16T09:49:35","date_gmt":"2023-03-16T01:49:35","guid":{"rendered":"http:\/\/123.57.164.21\/?p=9934"},"modified":"2023-03-16T09:49:35","modified_gmt":"2023-03-16T01:49:35","slug":"springboot-%e8%87%aa%e5%ae%9a%e4%b9%89%e6%b6%88%e6%81%af%e8%bd%ac%e6%8d%a2%e5%99%a8httpmessageconverter","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=9934","title":{"rendered":"Springboot \u81ea\u5b9a\u4e49\u6d88\u606f\u8f6c\u6362\u5668HttpMessageConverter"},"content":{"rendered":"\n

\u524d\u8a00<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u5728SpringMVC\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528@RequestBody\u548c@ResponseBody\u4e24\u4e2a\u6ce8\u89e3\uff0c\u5206\u522b\u5b8c\u6210\u8bf7\u6c42\u62a5\u6587\u5230\u5bf9\u8c61\u548c\u5bf9\u8c61\u5230\u54cd\u5e94\u62a5\u6587\u7684\u8f6c\u6362\uff0c\u5e95\u5c42\u8fd9\u79cd\u7075\u6d3b\u7684\u6d88\u606f\u8f6c\u6362\u673a\u5236\u5c31\u662f\u5229\u7528HttpMessageConverter\u6765\u5b9e\u73b0\u7684\uff0cSpring\u5185\u7f6e\u4e86\u5f88\u591aHttpMessageConverter\uff0c\u6bd4\u5982MappingJackson2HttpMessageConverter\uff0cStringHttpMessageConverter\u7b49\uff0c\u4e0b\u9762\u6211\u4eec\u6765\u81ea\u5b9a\u4e49\u81ea\u5df1\u7684\u6d88\u606f\u8f6c\u6362\u5668\u6765\u6ee1\u8db3\u81ea\u5df1\u7279\u5b9a\u7684\u9700\u6c42\uff0c\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a1\u3001\u4f7f\u7528spring\u6216\u8005\u7b2c\u4e09\u65b9\u63d0\u4f9b\u7684\u73b0\u6210\u7684HttpMessageConverter\uff0c2\u3001\u81ea\u5df1\u91cd\u5199\u4e00\u4e2aHttpMessageConverter\u3002<\/p>\n\n\n\n

\u914d\u7f6e\u4f7f\u7528FastJson\u63d2\u4ef6\u8fd4\u56dejson\u6570\u636e<\/strong><\/p>\n\n\n\n

\n\n\n\n

\u5728springboot\u9879\u76ee\u91cc\u5f53\u6211\u4eec\u5728\u63a7\u5236\u5668\u7c7b\u4e0a\u52a0\u4e0a@RestController\u6ce8\u89e3\u6216\u8005\u5176\u5185\u7684\u65b9\u6cd5\u4e0a\u52a0\u5165@ResponseBody\u6ce8\u89e3\u540e\uff0c\u9ed8\u8ba4\u4f1a\u4f7f\u7528jackson\u63d2\u4ef6\u6765\u8fd4\u56dejson\u6570\u636e\uff0c\u4e0b\u9762\u6211\u4eec\u5229\u7528fastjson\u4e3a\u6211\u4eec\u63d0\u4f9b\u7684FastJsonHttpMessageConverter\u6765\u8fd4\u56dejson\u6570\u636e\u3002<\/p>\n\n\n\n

\u9996\u5148\u8981\u5f15\u5165fastjson\u7684\u4f9d\u8d56\uff1a<\/p>\n\n\n\n

\u3000\u3000\u3000\u3000\u3000<dependency>\n            <groupId>com.alibaba<\/groupId>\n            <artifactId>fastjson<\/artifactId>\n            <version>1.2.31<\/version>\n        <\/dependency><\/pre>\n\n\n\n
\u63a5\u4e0b\u6765\u901a\u8fc7\u5b9e\u73b0WebMvcConfigurer\u63a5\u53e3\u6765\u914d\u7f6eFastJsonHttpMessageConverter\uff0cspringboot2.0\u7248\u672c\u4ee5\u540e\u63a8\u8350\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u6765\u8fdb\u884cweb\u914d\u7f6e\uff0c\u8fd9\u6837\u4e0d\u4f1a\u8986\u76d6\u6389springboot\u7684\u4e00\u4e9b\u9ed8\u8ba4\u914d\u7f6e\u3002\u914d\u7f6e\u7c7b\u5982\u4e0b\uff1a<\/p>\n\n\n\n
package com.example.demo;\n\nimport java.util.List;\n\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.http.converter.HttpMessageConverter;\nimport org.springframework.web.servlet.config.annotation.WebMvcConfigurer;\n\nimport com.alibaba.fastjson.serializer.SerializerFeature;\nimport com.alibaba.fastjson.support.config.FastJsonConfig;\nimport com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;\n\n@Configuration\npublic class MyWebmvcConfiguration implements WebMvcConfigurer{\n\n    @Override\n    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {\n        FastJsonHttpMessageConverter fjc = new FastJsonHttpMessageConverter();\n        FastJsonConfig fj = new FastJsonConfig();\n        fj.setSerializerFeatures(SerializerFeature.DisableCircularReferenceDetect);\n        fjc.setFastJsonConfig(fj);\n        converters.add(fjc);\n    }\n\n}<\/pre>\n\n\n\n
fastJson\u914d\u7f6e\u5b9e\u4f53\u8c03\u7528setSerializerFeatures\u65b9\u6cd5\u53ef\u4ee5\u914d\u7f6e\u591a\u4e2a\u8fc7\u6ee4\u65b9\u5f0f\uff0c\u5e38\u7528\u7684\u5982\u4e0b\uff1a<\/p>\n\n\n\n
  • 1\u3001WriteNullListAsEmpty\u00a0 \uff1aList\u5b57\u6bb5\u5982\u679c\u4e3anull,\u8f93\u51fa\u4e3a[],\u800c\u975enull<\/li>
  • 2\u3001WriteNullStringAsEmpty \uff1a \u5b57\u7b26\u7c7b\u578b\u5b57\u6bb5\u5982\u679c\u4e3anull,\u8f93\u51fa\u4e3a””,\u800c\u975enull<\/li>
  • 3\u3001DisableCircularReferenceDetect \uff1a\u6d88\u9664\u5bf9\u540c\u4e00\u5bf9\u8c61\u5faa\u73af\u5f15\u7528\u7684\u95ee\u9898\uff0c\u9ed8\u8ba4\u4e3afalse\uff08\u5982\u679c\u4e0d\u914d\u7f6e\u6709\u53ef\u80fd\u4f1a\u8fdb\u5165\u6b7b\u5faa\u73af\uff09<\/li>
  • 4\u3001WriteNullBooleanAsFalse\uff1aBoolean\u5b57\u6bb5\u5982\u679c\u4e3anull,\u8f93\u51fa\u4e3afalse,\u800c\u975enull<\/li>
  • 5\u3001WriteMapNullValue\uff1a\u662f\u5426\u8f93\u51fa\u503c\u4e3anull\u7684\u5b57\u6bb5,\u9ed8\u8ba4\u4e3afalse\u3002<\/li><\/ul>\n\n\n\n
    <\/p>\n\n\n\n
    \u5176\u5b83\u7684\u76f8\u5173\u7c7b\uff0c\u6211\u4eec\u5f15\u5165\u4e86lombok\u63d2\u4ef6<\/p>\n\n\n\n
    package com.example.demo;\n\nimport java.util.ArrayList;\nimport java.util.List;\n\nimport org.springframework.web.bind.annotation.RequestBody;\nimport org.springframework.web.bind.annotation.RequestMapping;\nimport org.springframework.web.bind.annotation.RequestMethod;\nimport org.springframework.web.bind.annotation.ResponseBody;\nimport org.springframework.web.bind.annotation.RestController;\n\n@RestController\npublic class UserController {\n\n    @RequestMapping(value=\"\/get\",method=RequestMethod.GET)\n    public Object getList(){\n        List<UserEntity> list= new ArrayList<UserEntity>();\n        UserEntity u1 = new UserEntity(null, \"shanghai\");\n        list.add(u1);\n        return list;\n    }\n\n}<\/pre>\n\n\n\n
    package com.example.demo;\n\nimport lombok.AllArgsConstructor;\nimport lombok.Data;\n\n@Data\n@AllArgsConstructor\npublic class UserEntity {\n    private String name;\n    private String address;\n        \n}<\/pre>\n\n\n\n
    \u8bbe\u7f6e\u7aef\u53e3\u4e3a8888\uff0c\u542f\u52a8\u9879\u76ee\u8bbf\u95eehttp:\/\/localhost:8888\/get\uff0c\u6211\u4eec\u4ee3\u7801\u4e2d\u6ca1\u6709\u914d\u7f6eWriteMapNullValue\uff0c\u6240\u4ee5\u5982\u679c\u8fd4\u56de\u7ed3\u679c\u4e2d\u6709null\u503c\u5219\u4e0d\u663e\u793a\uff0c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    \"\"<\/figure><\/div>\n\n\n\n
    \u6211\u4eec\u6ce8\u91ca\u6389fastjson\u914d\u7f6e\uff0c\u91cd\u65b0\u542f\u52a8\u9879\u76ee\u5e76\u8bbf\u95ee\uff0c\u4ece\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\u6211\u4eec\u914d\u7f6e\u7684\u6d88\u606f\u8f6c\u6362\u5668\u8d77\u4f5c\u7528\u4e86\u3002<\/p>\n\n\n\n
    \"\"<\/figure><\/div>\n\n\n\n
    \u91cd\u5199HttpMessageConverter<\/strong><\/p>\n\n\n\n
    \n\n\n\n
    \u63a5\u4e0b\u6765\u6211\u4eec\u7ee7\u627fAbstractHttpMessageConverter\u6765\u5b9e\u73b0\u4e00\u4e2a\u81ea\u5df1\u7684\u6d88\u606f\u8f6c\u6362\u5668\uff0c\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    package com.example.demo;\n\nimport org.springframework.http.HttpInputMessage;\nimport org.springframework.http.HttpOutputMessage;\nimport org.springframework.http.MediaType;\nimport org.springframework.http.converter.AbstractHttpMessageConverter;\nimport org.springframework.http.converter.HttpMessageNotReadableException;\nimport org.springframework.http.converter.HttpMessageNotWritableException;\nimport org.springframework.util.StreamUtils;\n\nimport java.io.IOException;\nimport java.nio.charset.Charset;\n\npublic class MyMessageConverter extends AbstractHttpMessageConverter<UserEntity> {\n\n\n    public MyMessageConverter() {\n        \/\/ \u65b0\u5efa\u4e00\u4e2a\u6211\u4eec\u81ea\u5b9a\u4e49\u7684\u5a92\u4f53\u7c7b\u578bapplication\/xxx-junlin\n        super(new MediaType(\"application\", \"xxx-junlin\", Charset.forName(\"UTF-8\")));\n    }\n\n    @Override\n    protected boolean supports(Class<?> clazz) {\n        \/\/ \u8868\u660e\u53ea\u5904\u7406UserEntity\u7c7b\u578b\u7684\u53c2\u6570\u3002\n        return UserEntity.class.isAssignableFrom(clazz);\n    }\n\n    \/**\n     * \u91cd\u5199readlntenal \u65b9\u6cd5\uff0c\u5904\u7406\u8bf7\u6c42\u7684\u6570\u636e\u3002\u4ee3\u7801\u8868\u660e\u6211\u4eec\u5904\u7406\u7531\u201c-\u201d\u9694\u5f00\u7684\u6570\u636e\uff0c\u5e76\u8f6c\u6210 UserEntity\u7c7b\u578b\u7684\u5bf9\u8c61\u3002\n     *\/\n    @Override\n    protected UserEntity readInternal(Class<? extends UserEntity> clazz,\n            HttpInputMessage inputMessage) throws IOException,\n            HttpMessageNotReadableException {\n        String temp = StreamUtils.copyToString(inputMessage.getBody(), Charset.forName(\"UTF-8\"));\n        String[] tempArr = temp.split(\"-\");\n\n        return new UserEntity(tempArr[0],tempArr[1]);\n    }\n\n    \/**\n     * \u91cd\u5199writeInternal \uff0c\u5904\u7406\u5982\u4f55\u8f93\u51fa\u6570\u636e\u5230response\u3002\n     *\/\n    @Override\n    protected void writeInternal(UserEntity userEntity,\n            HttpOutputMessage outputMessage)\n            throws IOException, HttpMessageNotWritableException {\n        String out = \"hello: \" + userEntity.getName() + \"-\" + userEntity.getAddress();\n        outputMessage.getBody().write(out.getBytes());\n    }\n}<\/pre>\n\n\n\n
    \u5c06\u81ea\u5b9a\u4e49\u7684\u6d88\u606f\u8f6c\u6362\u5668\u52a0\u5165\u5230springmvc\u5bb9\u5668\u4e2d\uff0c\u4ee5\u4fbf\u88ab\u4f7f\u7528\u3002<\/p>\n\n\n\n
    package com.example.demo;\n\nimport java.util.List;\n\nimport org.springframework.context.annotation.Bean;\nimport org.springframework.context.annotation.Configuration;\nimport org.springframework.http.converter.HttpMessageConverter;\nimport org.springframework.web.servlet.config.annotation.WebMvcConfigurer;\n\nimport com.alibaba.fastjson.serializer.SerializerFeature;\nimport com.alibaba.fastjson.support.config.FastJsonConfig;\nimport com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;\n\n@Configuration\npublic class MyWebmvcConfiguration implements WebMvcConfigurer{\n\n    @Override\n    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {\n        FastJsonHttpMessageConverter fjc = new FastJsonHttpMessageConverter();\n        FastJsonConfig fj = new FastJsonConfig();\n        fj.setSerializerFeatures(SerializerFeature.DisableCircularReferenceDetect);\n        fjc.setFastJsonConfig(fj);\n        converters.add(fjc);\n        converters.add(converter());\n    }\n    @Bean\n    public MyMessageConverter converter() {\n        return new MyMessageConverter();\n    }\n\n}<\/pre>\n\n\n\n
    UserController\u4e2d\u52a0\u5165\u6d4b\u8bd5\u7684\u4ee3\u7801<\/p>\n\n\n\n
    package com.example.demo;\n\nimport java.util.ArrayList;\nimport java.util.List;\n\nimport org.springframework.web.bind.annotation.RequestBody;\nimport org.springframework.web.bind.annotation.RequestMapping;\nimport org.springframework.web.bind.annotation.RequestMethod;\nimport org.springframework.web.bind.annotation.ResponseBody;\nimport org.springframework.web.bind.annotation.RestController;\n\n@RestController\npublic class UserController {\n\n    @RequestMapping(value=\"\/get\",method=RequestMethod.GET)\n    public Object getList(){\n        List<UserEntity> list= new ArrayList<UserEntity>();\n        UserEntity u1 = new UserEntity(null, \"shanghai\");\n        list.add(u1);\n        return list;\n    }\n    \n    @RequestMapping(method = RequestMethod.POST, value = \"\/convert\")\n    public @ResponseBody UserEntity converter(@RequestBody UserEntity user) {\n        return user;\n    }\n}<\/pre>\n\n\n\n
    \u542f\u52a8\u9879\u76ee\uff0c\u4f7f\u7528postman\u6765\u6d4b\u8bd5\uff0c\u4ece\u54cd\u5e94\u6765\u770b\u6211\u4eec\u7684\u6d88\u606f\u8f6c\u6362\u5668\u5df2\u7ecf\u8d77\u4f5c\u7528\u4e86\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
    \"\"<\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"
    \u524d\u8a00 \u5728SpringMVC\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528@RequestBody\u548c@ResponseBody\u4e24\u4e2a\u6ce8\u89e3\uff0c\u5206\u522b\u5b8c\u6210\u8bf7 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,27],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/9934"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9934"}],"version-history":[{"count":1,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/9934\/revisions"}],"predecessor-version":[{"id":9938,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/9934\/revisions\/9938"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9934"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9934"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9934"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}