{"id":297202,"date":"2024-05-20T16:21:20","date_gmt":"2024-05-20T08:21:20","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/297202.html"},"modified":"2024-05-20T16:21:31","modified_gmt":"2024-05-20T08:21:31","slug":"tomcat-%e5%a6%82%e4%bd%95%e8%a7%a3%e6%9e%90-json-%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/297202.html","title":{"rendered":"tomcat \u5982\u4f55\u89e3\u6790 json \u5b57\u7b26\u4e32"},"content":{"rendered":"

\"tomcat<\/p>\n

Tomcat\u4f5c\u4e3a\u4e00\u4e2a\u6d41\u884c\u7684Java\u5e94\u7528\u670d\u52a1\u5668\uff0c\u672c\u8eab\u5e76\u4e0d\u76f4\u63a5\u89e3\u6790JSON\u5b57\u7b26\u4e32\u3002\u76f8\u53cd\uff0c\u5b83\u4e3a\u8fd0\u884c\u5728\u5176\u4e0a\u7684Java Web\u5e94\u7528\u7a0b\u5e8f\u63d0\u4f9b\u8fd0\u884c\u73af\u5883\u548c\u670d\u52a1\u3002\u56e0\u6b64\uff0c\u89e3\u6790JSON\u5b57\u7b26\u4e32\u901a\u5e38\u7531\u90e8\u7f72\u5728Tomcat\u4e0a\u7684Java\u5e94\u7528\u7a0b\u5e8f\u4e2d\u5177\u4f53\u5b9e\u73b0\u7684\u4ee3\u7801\u6765\u5b8c\u6210\u3002<\/strong> \u5e94\u7528\u7a0b\u5e8f\u901a\u5e38\u4f1a\u4f7f\u7528\u5982Jackson\u3001Gson\u8fd9\u6837\u7684\u5e93\u6765\u5904\u7406JSON\u3002\u5176\u4e2d\uff0cJackson\u975e\u5e38\u6d41\u884c\uff0c\u80fd\u591f\u9ad8\u6548\u5730\u628aJSON\u5b57\u7b26\u4e32\u8f6c\u6362\u6210Java\u5bf9\u8c61\uff0c\u540c\u65f6\u4e5f\u652f\u6301\u5c06Java\u5bf9\u8c61\u5e8f\u5217\u5316\u4e3aJSON\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n

\u5728\u6b64\uff0c\u6211\u4eec\u4f1a\u8be6\u7ec6\u8ba8\u8bba\u5982\u4f55\u5728\u90e8\u7f72\u5728Tomcat\u4e0a\u7684Java\u5e94\u7528\u7a0b\u5e8f\u4e2d\u4f7f\u7528Jackson\u6765\u89e3\u6790JSON\u5b57\u7b26\u4e32\u3002\u4e0b\u9762\u7684\u7ae0\u8282\u5c06\u6db5\u76d6\u6240\u9700\u7684\u914d\u7f6e\u6b65\u9aa4\u3001\u4ee3\u7801\u793a\u4f8b\uff0c\u4ee5\u53ca\u5982\u4f55\u5904\u7406\u5e38\u89c1\u7684\u95ee\u9898\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u6dfb\u52a0Jackson\u5e93\u4f9d\u8d56<\/h3>\n<\/p>\n

\u9996\u5148\uff0c\u9700\u8981\u5728Java\u9879\u76ee\u4e2d\u6dfb\u52a0Jackson\u5e93\u7684\u4f9d\u8d56\u3002\u8fd9\u53ef\u4ee5\u901a\u8fc7\u9879\u76ee\u7684build\u6587\u4ef6\uff08\u4f8b\u5982pom.xml\u6587\u4ef6\uff0c\u5982\u679c\u4f60\u4f7f\u7528Maven\uff09\u6765\u5b8c\u6210\u3002<\/p>\n<\/p>\n

<dependency><\/p>\n
    <groupId>com.fasterxml.jackson.core<\/groupId><\/p>\n
    <artifactId>jackson-databind<\/artifactId><\/p>\n
    <version>2.13.1<\/version><\/p>\n
<\/dependency><\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u6784\u5efa\u4e00\u4e2aJava\u5bf9\u8c61<\/h3>\n<\/p>\n
\u5728\u5f00\u59cb\u89e3\u6790JSON\u4e4b\u524d\uff0c\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u4e0eJSON\u6570\u636e\u7ed3\u6784\u76f8\u5bf9\u5e94\u7684Java\u7c7b\u3002<\/p>\n<\/p>\n
public class User {<\/p>\n
    private String name;<\/p>\n
    private int age;<\/p>\n
    \/\/ get\u548cset\u65b9\u6cd5\u7565<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528ObjectMapper\u89e3\u6790JSON\u5b57\u7b26\u4e32<\/h3>\n<\/p>\n
\u4f7f\u7528Jackson\u5e93\u4e2d\u7684ObjectMapper\u7c7b\uff0c\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u5c06JSON\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3aJava\u5bf9\u8c61\u3002<\/strong><\/p>\n<\/p>\n
import com.fasterxml.jackson.databind.ObjectMapper;<\/p>\n
public class JsonParser {<\/p>\n
    public User parseJsonToUser(String json) throws IOException {<\/p>\n
        ObjectMapper objectMapper = new ObjectMapper();<\/p>\n
        return objectMapper.readValue(json, User.class);<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u5904\u7406\u89e3\u6790\u5f02\u5e38<\/h3>\n<\/p>\n
\u5728\u89e3\u6790JSON\u65f6\uff0c\u53ef\u80fd\u4f1a\u9047\u5230\u5404\u79cd\u5f02\u5e38\u60c5\u51b5\uff0c\u8fd9\u4e9b\u90fd\u9700\u8981\u59a5\u5584\u5904\u7406\u3002<\/strong><\/p>\n<\/p>\n
public class JsonParser {<\/p>\n
    \/\/ ...<\/p>\n
    public User parseJsonToUser(String json) {<\/p>\n
        try {<\/p>\n
            ObjectMapper objectMapper = new ObjectMapper();<\/p>\n
            return objectMapper.readValue(json, User.class);<\/p>\n
        } catch (IOException e) {<\/p>\n
            \/\/ \u5904\u7406\u89e3\u6790\u9519\u8bef<\/p>\n
            \/\/ \u53ef\u4ee5\u8bb0\u5f55\u65e5\u5fd7\u3001\u8fd4\u56de\u9519\u8bef\u4fe1\u606f\u7b49<\/p>\n
        }<\/p>\n
        return null;<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528Gson\u4f5c\u4e3a\u66ff\u4ee3\u65b9\u6848<\/h3>\n<\/p>\n
\u867d\u7136\u672c\u6587\u91cd\u70b9\u8bb2\u89e3Jackson\uff0c\u4f46Gson\u4e5f\u662f\u4e00\u4e2a\u6d41\u884c\u7684JSON\u5904\u7406\u5e93\uff0c\u53ef\u4ee5\u4f5c\u4e3a\u66ff\u4ee3\u65b9\u6848\u3002<\/p>\n<\/p>\n
import com.google.gson.Gson;<\/p>\n
public class GsonJsonParser {<\/p>\n
    public User parseJsonToUser(String json) {<\/p>\n
        Gson gson = new Gson();<\/p>\n
        return gson.fromJson(json, User.class);<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u89e3\u6790\u590d\u6742\u7ed3\u6784\u7684JSON<\/h3>\n<\/p>\n
\u5bf9\u4e8e\u66f4\u590d\u6742\u7684JSON\u7ed3\u6784\uff0c\u53ef\u4ee5\u521b\u5efa\u5d4c\u5957\u7684Java\u7c7b\u6765\u5339\u914d\u8fd9\u79cd\u7ed3\u6784\uff0c\u7136\u540e\u7528\u76f8\u540c\u7684\u65b9\u6cd5\u8fdb\u884c\u89e3\u6790\u3002<\/p>\n<\/p>\n
public class Department {<\/p>\n
    private String name;<\/p>\n
    private List<User> users;<\/p>\n
    \/\/ get\u548cset\u65b9\u6cd5\u7565<\/p>\n
}<\/p>\n
public class ComplexJsonParser {<\/p>\n
    public Department parseJsonToDepartment(String json) throws IOException {<\/p>\n
        ObjectMapper objectMapper = new ObjectMapper();<\/p>\n
        return objectMapper.readValue(json, Department.class);<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e03\u3001\u914d\u7f6eTomcat\u4ee5\u652f\u6301\u7279\u5b9a\u7684JSON\u5b57\u7b26\u7f16\u7801<\/h3>\n<\/p>\n
\u4f60\u53ef\u80fd\u9700\u8981\u786e\u4fddTomcat\u80fd\u591f\u652f\u6301\u63a5\u6536\u548c\u53d1\u9001\u7684JSON\u6570\u636e\u7684\u5b57\u7b26\u7f16\u7801\uff0c\u7279\u522b\u662f\u5bf9\u4e8e\u975e\u82f1\u6587\u5b57\u7b26\u3002<\/p>\n<\/p>\n
<Connector port="8080" protocol="HTTP\/1.1"<\/p>\n
           connectionTimeout="20000"<\/p>\n
           redirectPort="8443"<\/p>\n
           URIEncoding="UTF-8" \/><\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516b\u3001\u5728RESTful API\u4e2d\u89e3\u6790JSON<\/h3>\n<\/p>\n
\u901a\u5e38\u5728Tomcat\u4e0a\u8fd0\u884c\u7684Java Web\u5e94\u7528\u7a0b\u5e8f\u4f1a\u4ee5RESTful API\u7684\u5f62\u5f0f\u63a5\u6536\u548c\u53d1\u9001JSON\u6570\u636e\u3002\u8fd9\u91cc\u5c55\u793a\u4e00\u4e2a\u7b80\u5355\u7684API\u7aef\u70b9\uff0c\u4f7f\u7528Spring MVC\u6765\u5904\u7406JSON\u6570\u636e\u3002<\/p>\n<\/p>\n
@RestController<\/p>\n
public class UserController {<\/p>\n
    @PostMapping(value = "\/users", consumes = "application\/json", produces = "application\/json")<\/p>\n
    public ResponseEntity<User> createUser(@RequestBody String userJson) {<\/p>\n
        ObjectMapper objectMapper = new ObjectMapper();<\/p>\n
        User user;<\/p>\n
        try {<\/p>\n
            user = objectMapper.readValue(userJson, User.class);<\/p>\n
        } catch (IOException e) {<\/p>\n
            return new ResponseEntity<>(HttpStatus.BAD_REQUEST);<\/p>\n
        }<\/p>\n
        \/\/ \u521b\u5efa\u7528\u6237\u7684\u903b\u8f91<\/p>\n
        return new ResponseEntity<>(user, HttpStatus.CREATED);<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e5d\u3001\u6d4b\u8bd5JSON\u89e3\u6790<\/h3>\n<\/p>\n
\u7f16\u5199\u5355\u5143\u6d4b\u8bd5\u6765\u9a8c\u8bc1JSON\u89e3\u6790\u7684\u6b63\u786e\u6027\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u53ef\u4ee5\u4f7f\u7528JUnit\u6846\u67b6\u6765\u7f16\u5199\u6d4b\u8bd5\u6848\u4f8b\u3002<\/p>\n<\/p>\n
public class JsonParserTest {<\/p>\n
    @Test<\/p>\n
    public void whenParseJson_thenGetUser() {<\/p>\n
        String userJson = "{\\"name\\":\\"John\\", \\"age\\":30}";<\/p>\n
        JsonParser parser = new JsonParser();<\/p>\n
        User user = parser.parseJsonToUser(userJson);<\/p>\n
        assertEquals("John", user.getName());<\/p>\n
        assertEquals(30, user.getAge());<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5341\u3001\u4f18\u5316Json\u89e3\u6790\u6027\u80fd<\/h3>\n<\/p>\n
\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u53ef\u4ee5\u4f7f\u7528ObjectMapper\u7684\u4e00\u4e9b\u9ad8\u7ea7\u914d\u7f6e\uff0c\u5982\u7981\u7528\u67d0\u4e9b\u4e0d\u5fc5\u8981\u7684\u7279\u6027\u3002<\/p>\n<\/p>\n
ObjectMapper objectMapper = new ObjectMapper();<\/p>\n
objectMapper.configure(DeserializationFeature.FAI<\/a>L_ON_UNKNOWN_PROPERTIES, false);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u7efc\u4e0a\u6240\u8ff0\uff0c\u5c3d\u7ba1Tomcat\u672c\u8eab\u4e0d\u63d0\u4f9bJSON\u89e3\u6790\u7684\u529f\u80fd\uff0c\u4f46\u5728\u5176\u4e0a\u8fd0\u884c\u7684Java\u5e94\u7528\u53ef\u4ee5\u4f7f\u7528Jackson\u6216Gson\u7b49\u5e93\u6765\u5904\u7406JSON\u6570\u636e\u3002\u901a\u8fc7\u9002\u5f53\u7684\u7c7b\u7ed3\u6784\u3001\u5f02\u5e38\u5904\u7406\u4ee5\u53caAPI\u7684\u8bbe\u8ba1\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5728Tomcat\u670d\u52a1\u5668\u4e0a\u8fdb\u884cJSON\u6570\u636e\u7684\u89e3\u6790\u548c\u5904\u7406\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
Q: \u5982\u4f55\u5728 Tomcat \u4e2d\u89e3\u6790 JSON \u5b57\u7b26\u4e32\uff1f<\/strong>
\nA: \u89e3\u6790 JSON \u5b57\u7b26\u4e32\u5728 Tomcat \u4e2d\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528 Java \u7684 JSON \u89e3\u6790\u5e93\u6765\u5b9e\u73b0\u3002\u5e38\u7528\u7684\u5e93\u5305\u62ec Jackson\u3001Gson \u548c JSON.simple\u3002\u4f60\u53ef\u4ee5\u9009\u62e9\u4efb\u4f55\u4e00\u79cd\u5e93\u6765\u89e3\u6790 JSON \u5b57\u7b26\u4e32\u3002<\/p>\n
Q: \u54ea\u4e2a JSON \u89e3\u6790\u5e93\u9002\u7528\u4e8e Tomcat\uff1f<\/strong>
\nA: \u5728\u4f7f\u7528 Tomcat \u89e3\u6790 JSON \u5b57\u7b26\u4e32\u65f6\uff0c\u4f60\u53ef\u4ee5\u9009\u62e9\u4f7f\u7528\u4e0d\u540c\u7684 JSON \u89e3\u6790\u5e93\u3002Jackson \u662f\u4e00\u4e2a\u529f\u80fd\u5f3a\u5927\u4e14\u88ab\u5e7f\u6cdb\u4f7f\u7528\u7684\u5e93\uff0c\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06 JSON \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a Java \u5bf9\u8c61\u4ee5\u53ca\u5c06 Java \u5bf9\u8c61\u8f6c\u6362\u4e3a JSON \u5b57\u7b26\u4e32\u3002Gson \u662f\u53e6\u4e00\u4e2a\u5e38\u89c1\u7684\u9009\u62e9\uff0c\u5b83\u5177\u6709\u7b80\u5355\u6613\u7528\u7684 API\uff0c\u5e76\u80fd\u591f\u5904\u7406\u590d\u6742\u7684 JSON \u7ed3\u6784\u3002JSON.simple \u662f\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u4e14\u6027\u80fd\u8f83\u9ad8\u7684\u5e93\uff0c\u9002\u7528\u4e8e\u7b80\u5355\u7684 JSON \u89e3\u6790\u9700\u6c42\u3002<\/p>\n
Q: \u5982\u4f55\u4f7f\u7528 Jackson \u5728 Tomcat \u4e2d\u89e3\u6790 JSON \u5b57\u7b26\u4e32\uff1f<\/strong>
\nA: \u4f7f\u7528 Jackson \u89e3\u6790 JSON \u5b57\u7b26\u4e32\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
    \n
  1. \u6dfb\u52a0 Jackson \u7684\u76f8\u5173\u4f9d\u8d56\u5230\u4f60\u7684\u9879\u76ee\u4e2d\u3002<\/li>\n
  2. \u521b\u5efa ObjectMapper \u5bf9\u8c61\uff0c\u5b83\u8d1f\u8d23 JSON \u5b57\u7b26\u4e32\u4e0e Java \u5bf9\u8c61\u4e4b\u95f4\u7684\u8f6c\u6362\u3002<\/li>\n
  3. \u4f7f\u7528 ObjectMapper \u7684 readValue()<\/code> \u65b9\u6cd5\uff0c\u5c06 JSON \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4f60\u7684 Java \u5bf9\u8c61\u3002<\/li>\n<\/ol>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528 Jackson \u89e3\u6790 JSON \u5b57\u7b26\u4e32\u7684\u793a\u4f8b\u4ee3\u7801:<\/p>\n
    import com.fasterxml.jackson.databind.ObjectMapper;\n\n\/\/ JSON \u5b57\u7b26\u4e32\nString jsonString = "{\\"name\\":\\"Tom\\", \\"age\\":25}";\n\n\/\/ \u521b\u5efa ObjectMapper \u5bf9\u8c61\nObjectMapper objectMapper = new ObjectMapper();\n\n\/\/ \u4f7f\u7528 readValue() \u65b9\u6cd5\u89e3\u6790 JSON \u5b57\u7b26\u4e32\ntry {\n    \/\/ \u5c06 JSON \u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a Java \u5bf9\u8c61\n    YourObject yourObject = objectMapper.readValue(jsonString, YourObject.class);\n    \/\/ \u5bf9\u89e3\u6790\u540e\u7684\u5bf9\u8c61\u8fdb\u884c\u64cd\u4f5c\n} catch (IOException e) {\n    e.printStackTrace();\n}\n<\/code><\/pre>\n
    \u8bf7\u6839\u636e\u4f60\u7684\u9700\u6c42\u9009\u62e9\u9002\u5408\u7684 JSON \u89e3\u6790\u5e93\uff0c\u5e76\u6839\u636e\u5e93\u7684\u6587\u6863\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Tomcat\u4f5c\u4e3a\u4e00\u4e2a\u6d41\u884c\u7684Java\u5e94\u7528\u670d\u52a1\u5668\uff0c\u672c\u8eab\u5e76\u4e0d\u76f4\u63a5\u89e3\u6790JSON\u5b57\u7b26\u4e32\u3002\u76f8\u53cd\uff0c\u5b83\u4e3a\u8fd0\u884c\u5728\u5176\u4e0a\u7684Java […]","protected":false},"author":3,"featured_media":297223,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/297202"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=297202"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/297202\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/297223"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=297202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=297202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=297202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}