HttpRequest 期间的文件上传答案

【问题标题】：FileUpload during HttpRequestHttpRequest 期间的文件上传
【发布时间】：2020-08-06 10:58:45
【问题描述】：

我正在尝试执行 HTTP GET 从 URL 获取参数，然后搜索 2 个文件并将信息发送回用户。我已经在没有任何服务器或请求的情况下尝试将 Java 代码放入主测试中，它可以正常工作，并且从 URL 中获取参数也可以工作。由于该文件是一个 Json 对象数组，因此还创建了其他类。

错误信息

HTTP Status 500 – Internal Server Error
Type Exception Report

Message org.glassfish.jersey.server.ContainerException: java.io.FileNotFoundException: \AutoCompilersz\src\net\codejava\ws\italy_cap.json (Impossibile trovare il percorso specificato)

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: org.glassfish.jersey.server.ContainerException: java.io.FileNotFoundException: \AutoCompilersz\src\net\codejava\ws\italy_cap.json (Impossibile trovare il percorso specificato)
    org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:408)
    org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:365)
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:318)
    org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

Java 文件

package net.codejava.ws;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;

import com.google.gson.Gson;
import com.google.gson.stream.JsonReader;

@Path("/form")
public class ComuniResource {
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public ArrayList<Cities> comuni(@QueryParam("cap") String cap) throws FileNotFoundException, IOException {
        Foglio1 p=new Foglio1();
        ArrayList <String> istat =  new ArrayList<String>();
        try (JsonReader reader=new JsonReader(new FileReader("/AutoCompilersz/src/net/codejava/ws/italy_cap.json"))) {
            Gson g = new Gson();
            p=g.fromJson(reader, Foglio1.class);
            //  System.out.println(p);
            //System.out.println(p.Foglio1.length);
            for(int i=0;i<p.Foglio1.length;i++) {
                if(p.Foglio1[i].cap.contentEquals(cap)) {
                    //System.out.println(p.Foglio1[i]);
                    istat.add(p.Foglio1[i].istat.toString());
                }
            }
        }
        Foglio_1 pp=new Foglio_1();
        Result result=new Result();
        try(JsonReader readerz=new JsonReader(new FileReader("/AutoCompilersz/src/net/codejava/ws/italy_cities.json"))){
            Gson g=new Gson();
            pp=g.fromJson(readerz, Foglio_1.class);
            //System.out.println(pp);
            //System.out.println(pp.Foglio1.length);
            for(int i=0;i<pp.Foglio1.length;i++) {
                for(int x=0;x<istat.size();x++) {
                    if(pp.Foglio1[i].istat.contentEquals(istat.get(x))) {
                        result.result.add(pp.Foglio1[i]);//pp.Foglio1[i]
                    }
                }
            }
        }
        return result.result;
    }
}

Pom.xml

<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>net.codejava.ws</groupId>
    <artifactId>AutoCompilersz</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet</artifactId>
            <version>2.29</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-server</artifactId>
            <version>2.29</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
            <version>2.29</version>
        </dependency>
        <dependency>
            <groupId>com.googlecode.json-simple</groupId>
            <artifactId>json-simple</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.26.0-GA</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jackson</artifactId>
            <version>2.29.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-annotations-api</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-catalina-ant</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-catalina-ha</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-ssi</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-storeconfig</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-tribes</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-catalina</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jdt</groupId>
            <artifactId>ecj</artifactId>
            <version>3.21.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-el-api</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jasper-el</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jasper</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jaspic-api</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jsp-api</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-servlet-api</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-api</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-coyote</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-dbcp</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-cs</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-de</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-es</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-fr</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-ja</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-ko</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-pt-BR</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-ru</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-i18n-zh-CN</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jdbc</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-jni</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-util-scan</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-util</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-websocket</artifactId>
            <version>9.0.37</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-websocket-api</artifactId>
            <version>9.0.37</version>
        </dependency>
    </dependencies>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <release>13</release>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.3</version>
                <configuration>
                    <warSourceDirectory>WebContent</warSourceDirectory>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" id="WebApp_ID" version="4.0">
  <display-name>AutoCompilersz</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
        <servlet-name>Jersey REST Service</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            [enter image description here][1]<param-name>jersey.config.server.provider.packages</param-name>
            <param-value>net.codejava.ws</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey REST Service</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app>

希望你能帮我解决我的问题。谢谢你:)

我的项目浏览器的照片 [1]：https://i.stack.imgur.com/4b2no.png

【问题讨论】：

它明确表示无法找到该文件。我认为您正在提供文件的相对路径。你试过给它绝对路径吗？
我在项目“/AutoCompilersz/src/net/codejava/ws/italy_cap.json”中给出了绝对路径，事实是当我将它测试到一个主要的也有相对路径("italy_cap.json") 效果很好
使用资源来保存像 json 这样的文件。 how-do-i-load-a-file-from-resource-folder
我没有先看你的文件结构图。为什么你的资源文件在src/net/codeJava/ws？您应该在src 内创建一个名为resource 的新文件夹并将您的文件放在那里。也许这有帮助。欢呼
如果我尝试使用 "InputStream is = classloader.getResourceAsStream("italy_cap")" g.fromJson 给我错误，因为它将文件视为 txt

标签： java tomcat jersey filenotfoundexception

【解决方案1】：

我是这样解决的：

try (InputStream is = getClass().getResourceAsStream("/resource/italy_cap.json")) {
            InputStreamReader isr = new InputStreamReader(is);
            JsonReader reader=new JsonReader(isr);
            Gson g = new Gson();
            p=g.fromJson(reader, Foglio1.class);

【讨论】：