修改空指针

pom.xml

@@ -69,6 +69,11 @@
             <groupId>javax.servlet</groupId>
             <artifactId>javax.servlet-api</artifactId>
         </dependency>
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+            <version>5.8.25</version>
+        </dependency>
     </dependencies>
     <dependencyManagement>
         <dependencies>

src/main/java/com/lh/controller/VoteController.java

@@ -9,6 +9,7 @@ import org.springframework.web.bind.annotation.*;
 
 import java.io.IOException;
 import java.net.URLEncoder;
+import java.util.Map;
 
 @CrossOrigin
 @RestController
@@ -29,12 +30,14 @@ public class VoteController {
     }
     //获取所有候选人
     @PostMapping ("/getCandidates")
-    public RespBean getCandidates(@RequestBody String token) throws IOException {
+    public RespBean getCandidates(@RequestBody Map<String, String> query) throws IOException {
+        String token = query.get("token");
         //System.out.println(token);
         ////将token的值分离出来
         //int startIndex = token.indexOf('=') + 1; // 找到等号的位置，并移动到等号后一位
         //String tokenValue = token.substring(startIndex); // 提取等号后面的部分
-        token = "token=" + URLEncoder.encode(token.substring(10, token.length() - 2), "UTF-8");
+//        token = "token=" + URLEncoder.encode(token.substring(10, token.length() - 2), "UTF-8");
+        token = "token=" + URLEncoder.encode(token, "UTF-8");
 
         System.out.println(token);
         String voterJwcode = String.valueOf(new Utils().getJwcode(token));

src/main/java/com/lh/exception/MyException.java

@@ -1,7 +1,7 @@
 package com.lh.exception;
 
-public class MyException extends Exception{
-    public MyException(String msg){
+public class MyException extends RuntimeException {
+    public MyException(String msg) {
         super(msg);
     }
 }

src/main/java/com/lh/until/Utils.java

@@ -1,8 +1,12 @@
 package com.lh.until;
 
+import cn.hutool.core.util.StrUtil;
+import cn.hutool.json.JSONUtil;
 import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.lh.bean.RespBean;
 import com.lh.bean.dto.TokenDTO;
+import com.lh.exception.MyException;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.http.client.methods.CloseableHttpResponse;
 import org.apache.http.client.methods.HttpPost;
@@ -17,6 +21,7 @@ import org.springframework.stereotype.Component;
 import javax.annotation.Resource;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
+import java.util.Optional;
 
 @Slf4j
 @Component
@@ -40,21 +45,24 @@ public class Utils {
             try (CloseableHttpResponse response = httpClient.execute(postRequest)) {
                 int responseCode = response.getStatusLine().getStatusCode(); // 获取状态码
                 // 检查响应状态
-                if (responseCode == 200) {
+                if (responseCode != 200) {
+                    throw new MyException("Failed : HTTP error code : " + responseCode);
+                }
+
                 // 读取响应体
                 String responseBody = EntityUtils.toString(response.getEntity(), StandardCharsets.UTF_8);
-                    // 使用Jackson解析JSON响应体
-                    ObjectMapper objectMapper = new ObjectMapper();
-                    JsonNode jsonResponse = objectMapper.readTree(responseBody);
-                    JsonNode dataNode = jsonResponse.get("data");
-                    TokenDTO tokenDTO = new TokenDTO();
-                    tokenDTO.setJwcode(dataNode.get("jwcode").asInt());
-                    tokenDTO.setUsername(dataNode.get("username").asText());
-                    return tokenDTO;
+                // 获取不到用户状态
+                if (StrUtil.isEmpty(responseBody)) {
+                    throw new MyException("用户状态获取失败");
                 }
-                else {
-                    throw new RuntimeException("Failed : HTTP error code : " + responseCode);
+
+                // 将token进行解析为RespBean
+                RespBean bean = JSONUtil.toBean(responseBody, RespBean.class);
+                if (bean.getCode() != 200) {
+                    throw new MyException("用户状态获取失败");
                 }
+
+                return JSONUtil.toBean(bean.getData().toString(), TokenDTO.class);
             }
         }
     }