http 500 Internal Server Error的错误 ajax请求SpringMVC后台中返回500 Internal Server Error
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使用httprequester接口测试能返回数据,但是用ajax返回json格式的时候返回报500Internal Server Error。
The server encountered an internal error that prevented it from fulfilling this request org.springframework .web.util.NestedServletException: Request processing failed; nested exception is…
springMVC+ajax 400 bad request —-请求的参数变量名-类型与后台的同名参数类型不匹配导致的,比如sys_no后台是String,前台页面传输的是数字类型就会出现这样的错误,springmvc直接将这个错误封装成400抛给了前端。开始提交是contentType : “application/json”形式,就报了400的错误,后面改成表单提交方式。
ajax提交参数到springmvc的后台,一直获取不到参数值,参数值为null——请求的方式不对,导致参数没有按后台约定的形式传递。比如下面实例的Controller接收的是一个名值对param是参数名、param的参数值是字符串类型。开始前台页面提交的数据是:data:param,后台获取param是得不到参数值的,因为到后台其实封装成了4个类似这样的参数名值对:sys_no=sys_no+”“,log_content=log_content+”“,page_size=15,page_no=page_no,并没有名称为param的参数,所以最后继续封装,将前端的param对象转成字符串,参数名为param,提交给后台:data : {“param”:JSON.stringify(param)},OK!
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使用注解@ResponseBody可以将结果(一个包含字符串和JavaBean的Map),转换成JSON。 使用 @RequestBody 注解前台只需要向 Controller 提交一段符合格式的 JSON,Spring 会自动将其拼装成 bean。 Spring这个转换是靠org.codehaus.jackson这个组件来实现的,所有需要引入jackson-core-asl和org.codehaus.jackson两个jar包 :
pom.xml:
<!-- spring @Responsebody convert object to json 使用的是 codehaus 依赖start...--> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-core-asl</artifactId> <version>1.9.13</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.9.13</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.3.1</version> </dependency><!-- spring @Responsebody convert object to json 使用的是 codehaus 依赖END--> <!-- fastjson依赖--> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.6</version> </dependency> <!--org.json依赖--> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20140107</version> </dependency> <!--net.sf.json依赖--> <dependency> <groupId>net.sf.json-lib</groupId> <artifactId>json-lib</artifactId> <version>2.4</version> <classifier>jdk15</classifier> </dependency>
spring-mvc.xml文件配置:
<!-- 默认的注解映射的支持 --> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8" /> </bean> <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"> <property name="supportedMediaTypes" value="application/json;charset=UTF-8" /> <property name="features"> <array> <value>WriteMapNullValue</value> <value>WriteNullStringAsEmpty</value> </array> </property> </bean> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="objectMapper"> <bean class="com.fasterxml.jackson.databind.ObjectMapper"> <property name="dateFormat"> <bean class="java.text.SimpleDateFormat"> <constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss"/> </bean> </property> </bean> </property> <property name="supportedMediaTypes"> <list> <value>text/json;charset=UTF-8</value> <value>text/html;charset=utf-8</value> <value>application/json;charset=UTF-8</value> <value>application/json</value> </list> </property> </bean> </mvc:message-converters> </mvc:annotation-driven>
Controller:
package org.byron4j.ynyn.controller;import java.io.IOException;import javax.servlet.http.HttpSession;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;import org.byron4j.ynyn.base.BaseLoggerController;import org.byron4j.ynyn.dto.response.QueryLoggerInfoResDto;import org.byron4j.ynyn.service.QueryLoggerService;import org.byron4j.ynyn.service.TaskListenerConfigService;import com.fasterxml.jackson.core.JsonGenerationException;import com.fasterxml.jackson.databind.JsonMappingException;import com.fasterxml.jackson.databind.ObjectMapper;@RestControllerpublic class QueryLoggerInfoController extends BaseLoggerController{ @Autowired QueryLoggerService queryLoggerService; @ResponseBody @RequestMapping(value="/queryLoggerInfo",method=RequestMethod.POST) public Object queryLoggerInfo(HttpSession session, String param) throws Exception{ QueryLoggerInfoResDto obj = queryLoggerService.queryLoggerInfo(param); // 测试返回对象的Jackson json转换 ObjectMapper om = new ObjectMapper(); try { om.writeValueAsString(obj); } catch (JsonGenerationException e) { e.printStackTrace(); } catch (JsonMappingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return obj ; }}
响应实体对象:
package org.byron4j.ynyn.dto.response;import java.util.List;import lombok.Getter;import lombok.Setter;import org.byron4j.ynyn.base.BaseResDto;import com.fasterxml.jackson.annotation.JsonInclude;import com.fasterxml.jackson.annotation.JsonInclude.Include;/** * * @Getter @Setter 是lombok的注解--小而巧的代码生成插件--减少实体类代码量 * 实例详解可参考:http://blog.csdn.net/zixiao217/article/category/6302134 */@Getter@Setter@JsonInclude(Include.ALWAYS)public class QueryLoggerInfoResDto extends BaseResDto{ private static final long serialVersionUID = -6778903837998066869L; private int total_amount; List<LoggerInfoDto> log_list;}
响应实体类的基类:
package org.byron4j.ynyn.base;import java.io.Serializable;import lombok.Data;import com.fasterxml.jackson.annotation.JsonInclude;import com.fasterxml.jackson.annotation.JsonInclude.Include;@Data@JsonInclude(Include.ALWAYS)public class BaseResDto implements Serializable{ private static final long serialVersionUID = 6926791530160100430L; private String resultCode; private String resultDesc;}
使用jquery的ajax的jsp代码:
var param = { "sys_no":sys_no+"", "log_content":log_content+"", "page_size":15, "page_no":page_no } $.ajax({ type : "POST", async:false, url : window.location+"queryLoggerInfo", /*使用表单提交方式*/ contentType : "application/x-www-form-urlencoded", dataType:"json", /*后台接收的是参数名为param(Controller方法的参数可以看出),所以需要封装成param:值的形式(字符串)*/ data : {"param":JSON.stringify(param)}, success : function(data) { ... } });
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