2019独角兽企业重金招聘Python工程师标准>>> 
常用的ResponseEntity.BodyBuilder和自定义ResponseEntity例子
ResponseEntity.ok() 和 ResponseEntity.BodyBuilder()
返回200(HttpStatus.SC_OK)
@RequestMapping("/check")
public ResponseEntity check() {
BodyBuilder builder = (BodyBuilder) ResponseEntity.ok();
builder.allow(HttpMethod.GET);
builder.contentType(MediaType.TEXT_HTML);
builder.eTag("W/MyeTag\"");
return builder.body("Hello World!");
} ResponseEntity.status()
使用HttpStatus返回需要的HttpCode
@RequestMapping("/handle")
public ResponseEntity handle() {
return ResponseEntity.status(HttpStatus.SC_CREATED).body("Created Success");
} ResponseEntity.created()
返回201（HttpStatus.SC_CREATED)
@RequestMapping("/handle")
public ResponseEntity handle() {
URI location = null;
try {
location = new URI("http://www.concretepage.com/");
} catch (URISyntaxException e) {
e.printStackTrace();
}
return ResponseEntity.created(location).build();
} ResponseEntity.accepted()
返回202（HttpStatus.SC_ACCEPTED)
@RequestMapping("/handle")
public ResponseEntity handle() {
return ResponseEntity.accepted().body("Hello World!");
} ResponseEntity.noContent()
返回204（HttpStatus.SC_NO_CONTENT)
@RequestMapping("/handle")
public ResponseEntity handle() {
return ResponseEntity.noContent().build();
} ResponseEntity.badRequest()
返回400（HttpStatus.SC_BAD_REQUEST)
@RequestMapping("/handle")
public ResponseEntity handle() {
return ResponseEntity.badRequest().body("Bad Request");
} ResponseEntity.notFound()
返回404（HttpStatus.SC_NOT_FOUND)
@RequestMapping("/handle")
public ResponseEntity handle() {
return ResponseEntity.notFound().build();
} 使用实例：
pom.xml
commons-io
commons-io
2.4
FileController.java
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
@Controller
@RequestMapping(value = "/file")
public class FileController {
private static final Logger logger = LoggerFactory.getLogger(FileController.class);
@Value("${spring.http.multipart.location}")
private String uploadPath;
@RequestMapping(value = "upload")
@ResponseBody
public String upload(@RequestParam("roncooFile") MultipartFile file) {
if (file.isEmpty()) {
return "文件为空";
}
// 获取文件名
String fileName = file.getOriginalFilename();
logger.info("上传的文件名为：" + fileName);
// 获取文件的后缀名
// String suffixName = fileName.substring(fileName.lastIndexOf("."));
// logger.info("上传的后缀名为：" + suffixName);
// 解决中文问题，liunx下中文路径，图片显示问题
// fileName = UUID.randomUUID() + suffixName;
File dest = new File(uploadPath + "/" + fileName);
// 检测是否存在目录
if (!dest.getParentFile().exists()) {
dest.getParentFile().mkdirs();
} else if (dest.exists()) {
return "文件已经存在！";
}
try {
file.transferTo(dest);
return "上传成功";
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return "上传失败";
}
@RequestMapping("download")
public ResponseEntity download(String filepath) throws IOException, URISyntaxException {
File file = new File(filepath);
HttpHeaders headers = new HttpHeaders();
if (!file.exists()) {
URI location = new URI(filepath);
HttpHeaders responseHeaders = new HttpHeaders();
responseHeaders.setLocation(location);
responseHeaders.set("MyResponseHeader", "MyValue");
return new ResponseEntity("文件路径不正确！", responseHeaders, HttpStatus.NOT_FOUND);
// return ResponseEntity.noContent().build();
// return ResponseEntity.notFound().build();
}
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
headers.setContentDispositionFormData("attachment", file.getName());
byte[] bytes = FileUtils.readFileToByteArray(file);
return new ResponseEntity(bytes, headers, HttpStatus.CREATED);
}
}