我是SpringBoot的新手。我正在尝试制作一个小型应用程序，该程序可以在我选择的目录中上传csv文件。为此，用户将使用两个字段（问题类型和粒度）填写一个小表格。根据用户选择的内容，文件将被上传到该目录中。例如，如果用户选择要借出的问题而选择每周要选择的粒度，则文件将存储在C:\Users\loan\weekly中。
这是我的代码：
UploadingController.java。
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
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.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
@Controller
public class UploadingController {
@RequestMapping(value = "/dropdown", method = RequestMethod.GET)
public ModelAndView user() {
Dropdown dropdown = new Dropdown();
dropdown.setIssue("Loan");
dropdown.setGranularity("Daily");
ModelAndView modelAndView = new ModelAndView("dropdown", "command", dropdown);
return modelAndView;
}
@RequestMapping(value = "/addDropdown", method = RequestMethod.POST)
public String addUser(@ModelAttribute("SpringWeb")Dropdown dropdown,
ModelMap model) {
model.addAttribute("issue", dropdown.getIssue());
model.addAttribute("granularity", dropdown.getGranularity());
return "dropdown";
}
@ModelAttribute("firstdropdown")
public Map<String, String> getFirstDropdown() {
Map<String, String> firstdropdown = new HashMap<String, String>();
firstdropdown.put("Loan", "Loan");
firstdropdown.put("Lease", "Lease");
firstdropdown.put("Other", "Other");
return firstdropdown;
}
@ModelAttribute("seconddropdown")
public Map<String, String> getSecondDropdown() {
Map<String, String> seconddropdown = new HashMap<String, String>();
seconddropdown.put("Daily", "Daily");
seconddropdown.put("Weekly", "Weekly");
seconddropdown.put("Monthly", "Monthly");
return seconddropdown;
}
public static String uploadingDir = System.getProperty("user.home");
@GetMapping("/uploading")
public String uploading(Model model) {
File file = new File(uploadingDir);
model.addAttribute("files", file.listFiles());
return "uploading";
}
@PostMapping("/uploading-post")
public String uploadingPost(@RequestParam("uploadingFiles") MultipartFile uploadingFiles,
@RequestParam("firstdropdown") String firstdropdown,
@RequestParam("seconddropdown") String seconddropdown) throws IOException {
File file = new File(uploadingDir + uploadingFiles.getOriginalFilename());
uploadingFiles.transferTo(file);
return "redirect:/dropdown"; // redirect accordingly
}
}
而且，这就是我通过添加以下代码块来调整uploading.ftl的方式。作为HTML代码，它可以很好地工作：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Uploading Files Example with Spring Boot, Freemarker</title>
</head>
<body onload="updateSize();">
<form name="uploadingForm" enctype="multipart/form-data" action="/" method="POST">
<select name="mydropdown">
<option value="Blank"> </option>
<option value="Loan">Loan</option>
<option value="Lease">Lease</option>
<option value="Other">Other</option>
</select>
<select name="seconddropdown">
<option value="Blank"> </option>
<option value="Daily">Daily</option>
<option value="Weekly">Weekly</option>
<option value="Monthly">Monthy</option>
</select>
<p>
<input id="fileInput" type="file" name="uploadingFiles" onchange="updateSize();" multiple>
selected files: <span id="fileNum">0</span>;
total size: <span id="fileSize">0</span>
</p>
<p>
<input type="submit" value="Upload files">
</p>
</form>
<div>
<div>Uploaded files:</div>
<#list files as file>
<div>
${file.getName()}
</div>
</#list>
</div>
<script>
function updateSize() {
var nBytes = 0,
oFiles = document.getElementById("fileInput").files,
nFiles = oFiles.length;
for (var nFileId = 0; nFileId < nFiles; nFileId++) {
nBytes += oFiles[nFileId].size;
}
var sOutput = nBytes + " bytes";
// optional code for multiples approximation
for (var aMultiples = ["KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB"], nMultiple = 0, nApprox = nBytes / 1024; nApprox > 1; nApprox /= 1024, nMultiple++) {
sOutput = nApprox.toFixed(3) + " " + aMultiples[nMultiple] + " (" + nBytes + " bytes)";
}
// end of optional code
document.getElementById("fileNum").innerHTML = nFiles;
document.getElementById("fileSize").innerHTML = sOutput;
}
</script>
</body>
</html>
Dropdown.java类：
package com.hellokoding.uploadingfiles;
public class Dropdown {
private String issue;
private String granularity;
public String getIssue() {
return issue;
}
public void setIssue(String issue) {
this.issue = issue;
}
public String getGranularity() {
return granularity;
}
public void setGranularity(String granularity) {
this.granularity = granularity;
}
}
和Application.Java：
package com.hellokoding.uploadingfiles;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import java.io.File;
import java.io.IOException;
@SpringBootApplication
public class Application {
public static void main(String[] args) throws IOException {
new File(UploadingController.uploadingDir).mkdirs();
SpringApplication.run(Application.class, args);
}
}
DropdownController.java类：
package com.hellokoding.uploadingfiles;
import java.util.HashMap;
import java.util.Map;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller("/dropdown")
public class DropDownController {
@RequestMapping(value = "/issueTypes", method = RequestMethod.GET)
public Map<String, String> getFirs() {
Map<String, String> firstdropdown = new HashMap<String, String>();
firstdropdown.put("issueTypes", "Loan, Lease, Ranl");
return firstdropdown;
}
@RequestMapping(value = "/granularities", method = RequestMethod.GET)
public Map<String, String> getGranularity() {
Map<String, String> granularities = new HashMap<String, String>();
granularities.put("granularities", "Daily, Weekly ,Monthly");
return granularities;
}
}
Application.properties文件：
spring.freemarker.template-loader-path: /
spring.freemarker.suffix: .ftl
issue.type=Loan,Leas,Rank
report.granularity=Daily,Weekly,Monthly
我得到的错误：
javax.servlet.ServletException: Circular view path [dropdown]: would dispatch back to the current handler URL [/dropdown] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)
at org.springframework.web.servlet.view.InternalResourceView.prepareForRendering(InternalResourceView.java:209) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:147) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:316) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1370) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1116) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1055) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1005) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:897) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:634) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:882) ~[spring-webmvc-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:92) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:791) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1417) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.13.jar:9.0.13]
at java.base/java.lang.Thread.run(Thread.java:835) ~[na:na]
答案 0 :(得分：1)
您的问题是您的HTML代码。您有两种不同的表单用于发布表单。 像这样纠正它：
this.svg.append('g')
.attr('transform', 'translate(0,' + this.height + ')')
.call(this.xAxis.tickFormat(()=>{this.multiFormat()}));
更新
按如下方式更新您的控制器：
<form action="/" method="GET">
<input list="firstdropdown" name="firstdropdown">
<datalist id="firstdropdown">
<option value="Loan">Loan</option>
<option value="Lease">Lease</option>
<option value="Other">Other</option>
</datalist>
<input list="seconddropdown" name="seconddropdown">
<datalist id="seconddropdown">
<option value="Daily">Daily</option>
<option value="Weekly">Weekly</option>
<option value="Monthly">Monthy</option>
</datalist>
<button type="submit">SEND DATA</button>
</form>
更改HTML，例如：
@Controller
public class UploadingController {
public static String vary;
public static String uploadingDir = System.getProperty("user.home") + vary;
@GetMapping("/dir")
@ResponseBody
public String dir(@RequestParam("firstdropdown") String firstdropdown,
@RequestParam("seconddropdown") String seconddropdown) {
vary = "/" + firstdropdown + "/" + seconddropdown + "/";
return vary;
}
@GetMapping("/uploading")
public String uploading(Model model) {
File file = new File(uploadingDir);
model.addAttribute("files", file.listFiles());
return "uploading";
}
@PostMapping("/uploading-post")
public String uploadingPost(@RequestParam("uploadingFiles[]") MultipartFile[] uploadingFiles,
@RequestParam("firstdropdown") String firstdropdown,
@RequestParam("seconddropdown") String seconddropdown) throws IOException {
for(MultipartFile uploadedFile : uploadingFiles) {
File file = new File(uploadingDir + uploadedFile.getOriginalFilename());
uploadedFile.transferTo(file);
}
return "redirect:/uploading"; // redirect accordingly
}
}
更新
在您的<p>
<input id="fileInput" type="file" accept=".csv,text/csv" name="uploadingFiles[]" onchange="updateSize();">
selected files: <span id="fileNum">0</span>;
total size: <span id="fileSize">0</span>
</p>
文件中应用这些设置
application.properties如果您使用的是Spring Security，请忽略该映射，例如：
spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB
spring.http.multipart.max-file-size=10MB
spring.http.multipart.max-request-size=10MB
spring.http.multipart.enabled=true
对地图的某些更改
@Override
protected void configure(HttpSecurity http) throws Exception {
String[] ignoredCsrfMappings = {"/file-test"};
http.csrf().ignoringAntMatchers(ignoredCsrfMappings);
// rest of your settings
}
现在应该可以了。