欧美激情视屏在线观看,99精品女女视频

實現(xiàn)效果:

創(chuàng)建可以接收HTTP multi-part 文件上傳的服務(wù)器應(yīng)用程序.

項目結(jié)構(gòu)

└── src

    └── main

        └── java

            └── hello

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.springframework</groupId>
    <artifactId>gs-uploading-files</artifactId>
    <version>0.1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
    </parent>

    <properties>
        <java.version>1.8</java.version>
    </properties>


    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

1.創(chuàng)建一個應(yīng)用類

要啟動Spring Boot MVC應(yīng)用程序，首先需要一個啟動器; 這里，spring-boot-starter-thymeleaf和spring-boot-starter-web已經(jīng)被添加為依賴項。要使用Servlet容器上傳文件，需要注冊一個MultipartConfigElement類（在web.xml中為<multipart-config>）。 Spring Boot會自動配置！
src/main/java/hello/Application.java

package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

}

作為Spring MVC自動配置的一部分，Spring Boot將創(chuàng)建一個MultipartConfigElement類型 bean，并為文件上傳做好準備。

2.創(chuàng)建一個文件上傳的controller

程序初始化時候已經(jīng)導(dǎo)入一些類來處理存儲和加載上傳的磁盤文件; 它們都位于hello.storage包中。將在FileUploadController中使用它們。
src/main/java/hello/FileUploadController.java

package hello;

import java.io.IOException;
import java.util.stream.Collectors;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import hello.storage.StorageFileNotFoundException;
import hello.storage.StorageService;

@Controller
public class FileUploadController {

    private final StorageService storageService;

    @Autowired
    public FileUploadController(StorageService storageService) {
        this.storageService = storageService;
    }

    @GetMapping("/")
    public String listUploadedFiles(Model model) throws IOException {

        model.addAttribute("files", storageService.loadAll().map(
                path -> MvcUriComponentsBuilder.fromMethodName(FileUploadController.class,
                        "serveFile", path.getFileName().toString()).build().toString())
                .collect(Collectors.toList()));

        return "uploadForm";
    }

    @GetMapping("/files/{filename:.+}")
    @ResponseBody
    public ResponseEntity<Resource> serveFile(@PathVariable String filename) {

        Resource file = storageService.loadAsResource(filename);
        return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION,
                "attachment; filename=\"" + file.getFilename() + "\"").body(file);
    }

    @PostMapping("/")
    public String handleFileUpload(@RequestParam("file") MultipartFile file,
            RedirectAttributes redirectAttributes) {

        storageService.store(file);
        redirectAttributes.addFlashAttribute("message",
                "You successfully uploaded " + file.getOriginalFilename() + "!");

        return "redirect:/";
    }

    @ExceptionHandler(StorageFileNotFoundException.class)
    public ResponseEntity<?> handleStorageFileNotFound(StorageFileNotFoundException exc) {
        return ResponseEntity.notFound().build();
    }

}

用@Controller注釋，使Spring MVC可以選擇并查找路由。每個方法都使用@GetMapping或@PostMapping進行標記，將路徑和HTTP操作綁定到特定的Controller。

GET /請求,從StorageService中獲取當(dāng)前上載文件列表，并將其加載到Thymeleaf模板中。它使用MvcUriComponentsBuilder計算出資源的真實鏈接.
GET / files / {filename} 請求,加載資源（如果存在）并用“Content-Disposition”作為響應(yīng)頭,將其發(fā)送到瀏覽器進行下載.
POST /請求,用來處理多部分消息文件并將其提供給Storage Service進行保存

在實際生產(chǎn)環(huán)境中，有可能將文件存儲在臨時位置，數(shù)據(jù)庫或Mongo的GridFS之類的NoSQL存儲中。最好不要使用content加載應(yīng)用程序的文件系統(tǒng)。
需要為控制器提供StorageService接口以與存儲層（例如文件系統(tǒng)）進行交互。接口是這樣的：
src/main/java/hello/storage/StorageService.java

package hello.storage;

import org.springframework.core.io.Resource;
import org.springframework.web.multipart.MultipartFile;

import java.nio.file.Path;
import java.util.stream.Stream;

public interface StorageService {

    void init();

    void store(MultipartFile file);

    Stream<Path> loadAll();

    Path load(String filename);

    Resource loadAsResource(String filename);

    void deleteAll();

}

下面提供一個簡單的接口實現(xiàn)代碼:

package hello.storage;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.stream.Stream;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.core.io.UrlResource;
import org.springframework.stereotype.Service;
import org.springframework.util.FileSystemUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

@Service
public class FileSystemStorageService implements StorageService {

    private final Path rootLocation;

    @Autowired
    public FileSystemStorageService(StorageProperties properties) {
        this.rootLocation = Paths.get(properties.getLocation());
    }

    @Override
    public void store(MultipartFile file) {
        String filename = StringUtils.cleanPath(file.getOriginalFilename());
        try {
            if (file.isEmpty()) {
                throw new StorageException("Failed to store empty file " + filename);
            }
            if (filename.contains("..")) {
                // This is a security check
                throw new StorageException(
                        "Cannot store file with relative path outside current directory "
                                + filename);
            }
            try (InputStream inputStream = file.getInputStream()) {
                Files.copy(inputStream, this.rootLocation.resolve(filename),
                    StandardCopyOption.REPLACE_EXISTING);
            }
        }
        catch (IOException e) {
            throw new StorageException("Failed to store file " + filename, e);
        }
    }

    @Override
    public Stream<Path> loadAll() {
        try {
            return Files.walk(this.rootLocation, 1)
                .filter(path -> !path.equals(this.rootLocation))
                .map(this.rootLocation::relativize);
        }
        catch (IOException e) {
            throw new StorageException("Failed to read stored files", e);
        }

    }

    @Override
    public Path load(String filename) {
        return rootLocation.resolve(filename);
    }

    @Override
    public Resource loadAsResource(String filename) {
        try {
            Path file = load(filename);
            Resource resource = new UrlResource(file.toUri());
            if (resource.exists() || resource.isReadable()) {
                return resource;
            }
            else {
                throw new StorageFileNotFoundException(
                        "Could not read file: " + filename);

            }
        }
        catch (MalformedURLException e) {
            throw new StorageFileNotFoundException("Could not read file: " + filename, e);
        }
    }

    @Override
    public void deleteAll() {
        FileSystemUtils.deleteRecursively(rootLocation.toFile());
    }

    @Override
    public void init() {
        try {
            Files.createDirectories(rootLocation);
        }
        catch (IOException e) {
            throw new StorageException("Could not initialize storage", e);
        }
    }
}

3.創(chuàng)建HTML 模板

src/main/resources/templates/uploadForm.html

<html xmlns:th="https://www.thymeleaf.org">
<body>

    <div th:if="${message}">
        <h2 th:text="${message}"/>
    </div>

    <div>
        <form method="POST" enctype="multipart/form-data" action="/">
            <table>
                <tr><td>File to upload:</td><td><input type="file" name="file" /></td></tr>
                <tr><td></td><td><input type="submit" value="Upload" /></td></tr>
            </table>
        </form>
    </div>

    <div>
        <ul>
            <li th:each="file : ${files}">
                <a th:href="${file}" th:text="${file}" />
            </li>
        </ul>
    </div>

</body>
</html>

模板分三部分:

頂部是判斷message變量存在則顯示.
中間是允許用戶上傳文件的form
底部是從后臺獲取的文件列表list

4.調(diào)整文件上載限制

配置文件上傳時，設(shè)置文件大小限制通常很有用。想象一下嘗試使用Spring Boot處理5GB文件上傳會發(fā)生什么，可以使用一些屬性設(shè)置調(diào)整其自動配置的MultipartConfigElement。
添加新的屬性到application.properties文件中:
src/main/resources/application.properties

spring.servlet.multipart.max-file-size=128KB
spring.servlet.multipart.max-request-size=128KB

總共上傳文件大小不超過128K
單個form表單提交的文件大小不超過128K

5.修改啟動類

src/main/java/hello/Application.java

package hello;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;

import hello.storage.StorageProperties;
import hello.storage.StorageService;

@SpringBootApplication
@EnableConfigurationProperties(StorageProperties.class)
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }

    @Bean
    CommandLineRunner init(StorageService storageService) {
        return (args) -> {
            storageService.deleteAll();
            storageService.init();
        };
    }
}

CommandLineRunner 初始化回調(diào)函數(shù).

建立一個可執(zhí)行的 JAR

利用maven打包war或者jar運行,這里不做介紹.
java -jar target/gs-uploading-files-0.1.0.jar

測試

啟動web服務(wù),訪問http://localhost:8080/
,選擇一個文件上傳,上傳成功后會看到類似下方信息:

You successfully uploaded <name of your file>!

測試方法2:

還可以用MockMvc測試應(yīng)用,而無需啟動Servlet 容器.
寫一個測試類:
src/test/java/hello/FileUploadTests.java

package hello;

import java.nio.file.Paths;
import java.util.stream.Stream;

import org.hamcrest.Matchers;
import org.junit.Test;
import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;

import static org.mockito.BDDMockito.given;
import static org.mockito.BDDMockito.then;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.fileUpload;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.model;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import hello.storage.StorageFileNotFoundException;
import hello.storage.StorageService;

@RunWith(SpringRunner.class)
@AutoConfigureMockMvc
@SpringBootTest
public class FileUploadTests {

    @Autowired
    private MockMvc mvc;

    @MockBean
    private StorageService storageService;

    @Test
    public void shouldListAllFiles() throws Exception {
        given(this.storageService.loadAll())
                .willReturn(Stream.of(Paths.get("first.txt"), Paths.get("second.txt")));

        this.mvc.perform(get("/")).andExpect(status().isOk())
                .andExpect(model().attribute("files",
                        Matchers.contains("http://localhost/files/first.txt",
                                "http://localhost/files/second.txt")));
    }

    @Test
    public void shouldSaveUploadedFile() throws Exception {
        MockMultipartFile multipartFile = new MockMultipartFile("file", "test.txt",
                "text/plain", "Spring Framework".getBytes());
        this.mvc.perform(fileUpload("/").file(multipartFile))
                .andExpect(status().isFound())
                .andExpect(header().string("Location", "/"));

        then(this.storageService).should().store(multipartFile);
    }

    @SuppressWarnings("unchecked")
    @Test
    public void should404WhenMissingFile() throws Exception {
        given(this.storageService.loadAsResource("test.txt"))
                .willThrow(StorageFileNotFoundException.class);

        this.mvc.perform(get("/files/test.txt")).andExpect(status().isNotFound());
    }

}

用MockMultipartFile測試文件上傳

也可以用下面方法測試:

package hello;

import org.junit.Test;
import org.junit.runner.RunWith;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.boot.test.web.client.TestRestTemplate;
import org.springframework.boot.web.server.LocalServerPort;
import org.springframework.core.io.ClassPathResource;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.multipart.MultipartFile;

import static org.assertj.core.api.Assertions.assertThat;
import static org.mockito.BDDMockito.given;
import static org.mockito.BDDMockito.then;
import static org.mockito.Matchers.any;

import hello.storage.StorageService;

@RunWith(SpringRunner.class)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class FileUploadIntegrationTests {

    @Autowired
    private TestRestTemplate restTemplate;

    @MockBean
    private StorageService storageService;

    @LocalServerPort
    private int port;

    @Test
    public void shouldUploadFile() throws Exception {
        ClassPathResource resource = new ClassPathResource("testupload.txt", getClass());

        MultiValueMap<String, Object> map = new LinkedMultiValueMap<String, Object>();
        map.add("file", resource);
        ResponseEntity<String> response = this.restTemplate.postForEntity("/", map,
                String.class);

        assertThat(response.getStatusCode()).isEqualByComparingTo(HttpStatus.FOUND);
        assertThat(response.getHeaders().getLocation().toString())
                .startsWith("http://localhost:" + this.port + "/");
        then(storageService).should().store(any(MultipartFile.class));
    }

    @Test
    public void shouldDownloadFile() throws Exception {
        ClassPathResource resource = new ClassPathResource("testupload.txt", getClass());
        given(this.storageService.loadAsResource("testupload.txt")).willReturn(resource);

        ResponseEntity<String> response = this.restTemplate
                .getForEntity("/files/{filename}", String.class, "testupload.txt");

        assertThat(response.getStatusCodeValue()).isEqualTo(200);
        assertThat(response.getHeaders().getFirst(HttpHeaders.CONTENT_DISPOSITION))
                .isEqualTo("attachment; filename=\"testupload.txt\"");
        assertThat(response.getBody()).isEqualTo("Spring Framework");
    }

}

用Spring處理文件上傳.

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九欧美,1769亚洲,黄色成人av

[原創(chuàng)]5.Spring文件上傳

[原創(chuàng)]5.Spring文件上傳

實現(xiàn)效果:

項目結(jié)構(gòu)

pom.xml

1.創(chuàng)建一個應(yīng)用類

2.創(chuàng)建一個文件上傳的controller

3.創(chuàng)建HTML 模板

4.調(diào)整文件上載限制

5.修改啟動類

建立一個可執(zhí)行的 JAR

測試

測試方法2:

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九 欧美,1769亚洲,黄色成人av

[原創(chuàng)]5.Spring文件上傳

實現(xiàn)效果:

項目結(jié)構(gòu)

pom.xml

1.創(chuàng)建一個應(yīng)用類

2.創(chuàng)建一個文件上傳的controller

3.創(chuàng)建HTML 模板

4.調(diào)整文件上載限制

5.修改啟動類

建立一個可執(zhí)行的 JAR

測試

測試方法2:

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

色偷偷精品伊人,欧洲久久精品,欧美综合婷婷骚逼,国产AV主播,国产最新探花在线,九色在线视频一区,伊人大交九欧美,1769亚洲,黄色成人av