小编sha*_*zin的帖子

我正在尝试使用RestTemplate上传一个文件,代码如下.

   MultiValueMap<String, Object> multipartMap = new LinkedMultiValueMap<>();
   multipartMap.add("file", new ClassPathResource(file));

   HttpHeaders headers = new HttpHeaders();
   headers.setContentType(new MediaType("multipart", "form-data"));

   HttpEntity<MultiValueMap<String, Object>> request = new HttpEntity<MultiValueMap<String, Object>>(multipartMap, headers);

   System.out.println("Request for File Upload : " + request);

   ResponseEntity<byte[]> result = template.get().exchange(
                    contextPath.get() + path, HttpMethod.POST, request,
                    byte[].class);

我有MultipartResolverbean和Controller代码

@RequestMapping(value = "/{id}/image", method = RequestMethod.POST)
@ResponseStatus(HttpStatus.NO_CONTENT)
@Transactional(rollbackFor = Exception.class)
public byte[] setImage(@PathVariable("id") Long userId,
        @RequestParam("file") MultipartFile file) throws IOException {
    // Upload logic
}

我得到以下例外

 org.springframework.web.bind.MissingServletRequestParameterException: Required MultipartFile parameter 'file' is not …

I'm new to stackoverflow, but read tons of posts here and now stuck.my application.properties is read, but the portion for configuring hikaricp is ignored/has no effect.

I read https://www.javadevjournal.com/spring-boot/spring-boot-hikari/ and folowed those steps there, still any success.

pom.xml

    <dependencies>  
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-ehcache</artifactId>
        <version>5.4.10.Final</version>
        <exclusions>
            <exclusion>
                <groupId>net.sf.ehcache</groupId>
                <artifactId>ehcache</artifactId>
            </exclusion>
        </exclusions>
    </dependency>    
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-jcache</artifactId>
        <version>5.4.10.Final</version>
    </dependency>
    <dependency>
        <groupId>org.ehcache</groupId>
        <artifactId>ehcache</artifactId>
        <version>3.6.3</version>
    </dependency>        
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.apache.tomcat</groupId>
                <artifactId>tomcat-jdbc</artifactId>
            </exclusion>                
        </exclusions>
        <version>2.2.2.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
        <exclusions>
         <exclusion>
                <groupId>org.apache.tomcat</groupId>
                <artifactId>tomcat-jdbc</artifactId>
          </exclusion>
        </exclusions> …

我正在使用带有Spring Data Jpa的Query DSL QueryDslPredicateExecutor

我有以下实体;

@Table(name="a_table")
@Entity
public class A {

     @OneToOne
     @JoinColumn(name = "b_id")
     private B b;
}

@Table(name="b_table")
@Entity
public class B {

     @Column(...)
     private String name;
}

当我构建Predicate传递到我的存储库时,我做了类似的事情.

QA qa = QA.a;
BooleanBuilder booleanBuilder = new BooleanBuilder();       
for(String name : strings) {
    BooleanExpression b_name_eq= qa.b.name.eq(name);
    BooleanExpression some_other_expression = ...;
    booleanBuilder.or(ExpressionUtils.and(b_name_eq, some_other_expression));
}
return booleanBuilder.getValue();

这会产生如下查询

select ... , ... , ...
from a_table at
cross join b_table bt  
where at.b_id=bt.id 
and (bt.name=? and some_other_expression …