Java Servlet在Tomcat上不工作
我已经编写了一个Servlet来将文件上传到服务器并存储它们。只要我运行DevelopmentMode(这是一个GWT项目),一切都很好。但是因为我在Tomcat上部署了webapp,所以servlet甚至没有被调用Java Servlet在Tomcat上不工作,java,gwt,tomcat,servlets,Java,Gwt,Tomcat,Servlets,我已经编写了一个Servlet来将文件上传到服务器并存储它们。只要我运行DevelopmentMode(这是一个GWT项目),一切都很好。但是因为我在Tomcat上部署了webapp,所以servlet甚至没有被调用 public class ImageService extends HttpServlet { /** * */ private static final long serialVersionUID = 1L; private static final long MAX_F
public class ImageService extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private static final long MAX_FILE_SIZE = 1024 * 1024 * 1024; //1GB
@Override
protected void doPost(final HttpServletRequest request,
final HttpServletResponse response) {
slog("SERVLET STARTED");
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart) {
slog("REQUEST IS MULTIPART");
response.setStatus(HttpServletResponse.SC_OK);
response.setContentType("text/html");
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setFileSizeMax(MAX_FILE_SIZE);
try {
List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> iterator = items.iterator();
while (iterator.hasNext()) {
FileItem item = iterator.next();
if (!item.isFormField()) {
String fileName = item.getName();
slog("TROVATO FILE " + item.getName());
String root = getServletContext().getRealPath("/");
File path = new File(root + "/fileuploads");
slog("SALVO FILE IN " + path.getAbsolutePath());
if (!path.exists()) {
path.mkdirs();
}
File uploadedFile = creaFileNonAmbiguo(path, fileName);
slog("NOME ASSEGNATO AL FILE " + uploadedFile.getName());
item.write(uploadedFile);
response.getWriter().write(uploadedFile.getName() + ";");
}
}
response.getWriter().flush();
slog("RISPOSTA INVIATA");
} catch (Exception e) {
e.printStackTrace();
}
} else {
slog("LA RICHIESTA NON E' MULTIPART");
response.setStatus(HttpServletResponse.SC_NO_CONTENT);
}
slog("SERVLET TERMINATA");
}
@Override
protected void doGet(final HttpServletRequest request,
final HttpServletResponse response) {
response.setContentType("image/jpeg");
String root = getServletContext().getRealPath("/").concat(
"fileuploads/");
String path = root.concat(request.getParameter("src"));
File file = new File(path);
response.setContentLength((int) file.length());
FileInputStream in;
try {
in = new FileInputStream(file);
OutputStream out = response.getOutputStream();
byte[] buf = new byte[1024];
int len = 0;
while ((len = in.read(buf)) >= 0) {
out.write(buf, 0, len);
}
in.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private File creaFileNonAmbiguo(File path, String fileName) {
File res = new File(path + "/" + fileName);
if (!res.exists())
return res;
else {
return creaFileNonAmbiguo(path, "c".concat(fileName));
}
}
private void slog(String s) {
System.out.println("FILE SERVLET: " + s);
}
}
公共类ImageService扩展了HttpServlet{
/**
*
*/
私有静态最终长serialVersionUID=1L;
私有静态最终长最大文件大小=1024*1024*1024;//1GB
@凌驾
受保护的void doPost(最终HttpServletRequest请求,
最终HttpServletResponse(响应){
slog(“SERVLET启动”);
布尔值isMultipart=ServletFileUpload.isMultipartContent(请求);
if(isMultipart){
slog(“请求是多部分的”);
response.setStatus(HttpServletResponse.SC_OK);
response.setContentType(“text/html”);
FileItemFactory=new DiskFileItemFactory();
ServletFileUpload upload=新的ServletFileUpload(工厂);
upload.setFileSizeMax(最大文件大小);
试一试{
列表项=upload.parseRequest(请求);
迭代器迭代器=items.Iterator();
while(iterator.hasNext()){
FileItem=iterator.next();
如果(!item.isFormField()){
字符串文件名=item.getName();
slog(“TROVATO文件”+item.getName());
字符串root=getServletContext().getRealPath(“/”);
文件路径=新文件(root+“/fileuploads”);
slog(“SALVO文件位于”+path.getAbsolutePath());
如果(!path.exists()){
path.mkdirs();
}
File uploadedFile=creaFileNonAmbiguo(路径、文件名);
slog(“NOME ASSEGNATO AL FILE”+uploadedFile.getName());
item.write(上传文件);
response.getWriter().write(uploadedFile.getName()+“;”);
}
}
response.getWriter().flush();
长途跋涉(“因维塔之旅”);
}捕获(例外e){
e、 printStackTrace();
}
}否则{
slog(“LA RICHIESTA NON E‘MULTIPART”);
response.setStatus(HttpServletResponse.SC_NO_CONTENT);
}
长途跋涉(“SERVLET Termina”);
}
@凌驾
受保护的无效数据集(最终HttpServletRequest请求,
最终HttpServletResponse(响应){
response.setContentType(“图像/jpeg”);
字符串root=getServletContext().getRealPath(“/”).concat(
“文件上传/”;
字符串路径=root.concat(request.getParameter(“src”);
文件=新文件(路径);
response.setContentLength((int)file.length());
文件输入流输入;
试一试{
in=新文件输入流(文件);
OutputStream out=response.getOutputStream();
字节[]buf=新字节[1024];
int len=0;
而((len=in.read(buf))>=0){
out.write(buf,0,len);
}
in.close();
out.close();
}捕获(IOE异常){
e、 printStackTrace();
}
}
私有文件creaFileNonAmbiguo(文件路径、字符串文件名){
File res=新文件(路径+“/”+文件名);
如果(!res.exists())
返回res;
否则{
返回creaFileNonAmbiguo(路径“c”.concat(文件名));
}
}
私人空位(字符串s){
System.out.println(“文件SERVLET:+s);
}
}
我的代码怎么了?为什么它在devmode中工作而不是在Tomcat上
这是我的Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
version="2.5" xmlns="http://java.sun.com/xml/ns/javaee">
<!-- Servlets -->
<servlet>
<servlet-name>dataLayerServlet</servlet-name>
<servlet-class>com.tesi.server.DataLayerServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>dataLayerServlet</servlet-name>
<url-pattern>/segnalazioni_degrado/dataLayer</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.tesi.server.LoginServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/segnalazioni_degrado/login</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>mailServlet</servlet-name>
<servlet-class>com.tesi.server.MailServiceImpl</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>mailServlet</servlet-name>
<url-pattern>/segnalazioni_degrado/mail</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>imageServlet</servlet-name>
<servlet-class>com.tesi.server.ImageService</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>imageServlet</servlet-name>
<url-pattern>/segnalazioni_degrado/imageUpload</url-pattern>
</servlet-mapping>
<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>Segnalazioni_Degrado.html</welcome-file>
</welcome-file-list>
dataLayerServlet
com.tesi.server.DataLayerServiceImpl
dataLayerServlet
/segnalazioni_degrado/数据层
罗金瑟夫莱特酒店
com.tesi.server.LoginServiceImpl
罗金瑟夫莱特酒店
/segnalazioni_degrado/登录
mailServlet
com.tesi.server.MailServiceImpl
mailServlet
/segnalazioni_degrado/邮件
imageServlet
com.tesi.server.ImageService
imageServlet
/segnalazioni_degrado/imageUpload
Segnalazioni_Degrado.html
首先,根据您的web.xml,
imageServlet
映射到:
/segnalazioni_degrado/imageUpload
其次,您应该从url中删除问号,并尝试将其更改为:
localhost:8080/Segnalazioni_Degrado/imageUpload
看看会发生什么。好的,我解决了。问题是,servlet被映射到
/segnalazioni\u degrado/imageUpload
,而我的GWT主模块是segnalazioni\u degrado(大写字母)。
更改url模式成功了。如果您尝试手动调用它(即在浏览器中键入servlet url),会发生什么情况?@fatman您的意思是这样的?什么也没有发生。是的,你得到了什么错误?没有错误、消息或异常。只是什么都没有发生。我得到了404错误消息