Java 使用REST上传多个文件
我的html中有一个input type=file标记,允许用户选择多个文件。表单的操作是REST web服务:Java 使用REST上传多个文件,java,jakarta-ee,rest,Java,Jakarta Ee,Rest,我的html中有一个input type=file标记,允许用户选择多个文件。表单的操作是REST web服务: @POST @Path("savefile") @Produces ({MediaType.TEXT_PLAIN}) public String createObjects( @FormDataParam("datafile") FormDataMultiPart file, @FormParam("username") String unm
@POST
@Path("savefile")
@Produces ({MediaType.TEXT_PLAIN})
public String createObjects(
@FormDataParam("datafile") FormDataMultiPart file,
@FormParam("username") String unm
//@Context HttpServletRequest request
){....}
最初,我使用request对象检索请求中的所有FileItems,然后将其保存到服务器。没问题。现在我想发送一个字符串数据和文件。为此,我了解到参数的类型必须是FormDataParam。因此,我添加了该参数。这是我的客户代码:
<form id="form1" action="http://comp1:8080/RestWSGS/jersey/UploadFiles/savefile"
enctype="multipart/form-data" method="post">
<input name="username" type="text" style="display:none" value="abc"/>
<input id="loadId" multiple="multiple"
type="file" name="datafile" required="required" autofocus="autofocus"
onchange="selectFiles(this)"/>
<div>
<input style="display: none;" type="submit" value="Send">
</div>
</form>
但是我总是从request.getParameter(“username”)获取null值。我不知道出了什么问题!!在多部分/表单数据表单中发送其他数据是否非法??我这里需要一些指针。请对此代码提出任何改进建议。以下是适合我的解决方案。在多部分/formdata请求的情况下,可以使用部分中的输入流访问请求部分。我想向我的REST web服务发送一个字符串和一些文件。我在几个网站上找到了一个ServletFileUpload/FIleItem示例,但我无法检索该字符串(我认为如果所有数据都不是文件类型,则会出现异常)。因此,我将web服务修改为以下内容,而不是我可以处理字符串和一些文件:
private static Logger logger = Logger.getLogger("UploadFiles");
@POST
@Path("savefile")
public void createObjects(@Context HttpServletRequest request)
{
try
{
FileHandler f;
f = new FileHandler(new File (getClass().getResource("/" +getClass().getName().substring(
0, getClass().getName().indexOf("."))).getPath()).getParent().replaceAll("\\\\", "\\\\\\\\") + "/mylog.log");
logger.addHandler(f);
}
catch (SecurityException e1)
{
logger.info(e1.getMessage());
}
catch (IOException e1)
{
logger.info(e1.getMessage());
}
ApplicationConstants.ROOTPATH = new File (getClass().getResource("/" +getClass().getName().substring(
0, getClass().getName().indexOf("."))).getPath()).getParent().replaceAll("\\\\", "\\\\\\\\") ;
ApplicationConstants.ROOTPATH = ApplicationConstants.ROOTPATH.substring
(0, ApplicationConstants.ROOTPATH.indexOf("\\") + 2);
String user = request.getParameter("username");
logger.info("ApplicationConstants.ROOTPATH" + ApplicationConstants.ROOTPATH);
logger.info("username" + user);
try
{
for (Part part : request.getParts())
{
logger.info("part = " + part.getName());
if (!part.getName().equalsIgnoreCase("username"))
{
try {
BufferedInputStream in = new BufferedInputStream(part.getInputStream());
String filename = getFilename(part);
boolean success = (new File(ApplicationConstants.ROOTPATH + user + "\\")).mkdir();
if (success) {
System.out.println("Directory: " + ApplicationConstants.ROOTPATH + user .trim()+ "\\" + " created");
}
else
{
System.out.println("not created");
}
FileOutputStream out = new FileOutputStream(ApplicationConstants.ROOTPATH + user + "\\" + filename);
byte[] data = new byte[1000];
int bytesRead = 0;
int offset = 0;
while (offset < part.getSize())
{
bytesRead = in.read(data);
if (bytesRead == -1)
{
break;
}
offset += bytesRead;
out.write(data);
}
in.close();
if (offset != part.getSize())
{
throw new IOException("Only read " + offset + " bytes; Expected " + part.getSize() + " bytes");
}
out.flush();
out.close();
}
catch (Exception e)
{
logger.info(e.getMessage());
}
}
else
{
BufferedReader reader = new BufferedReader(new InputStreamReader(part.getInputStream(), "UTF-8"));
StringBuilder value = new StringBuilder();
char[] buffer = new char[1024];
reader.read(buffer);
value.append(buffer);
user = value.toString().trim();
logger.info("user = " + value);
}
}
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (ServletException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private static Logger=Logger.getLogger(“上传文件”);
@职位
@路径(“保存文件”)
public void createObjects(@Context-HttpServletRequest)
{
尝试
{
文件处理器f;
f=新文件处理程序(新文件(getClass().getResource(“/”+getClass().getName().substring(
0,getClass().getName().indexOf(“.”)).getPath().getParent().replaceAll(“\\\”,“\\\”+”/mylog.log”);
logger.addHandler(f);
}
捕获(安全异常e1)
{
logger.info(e1.getMessage());
}
捕获(IOE1异常)
{
logger.info(e1.getMessage());
}
ApplicationConstants.ROOTPATH=新文件(getClass().getResource(“/”+getClass().getName().substring(
0,getClass().getName().indexOf(“.”)).getPath().getParent().replaceAll(“\\\”,“\\”;
ApplicationConstants.ROOTPATH=ApplicationConstants.ROOTPATH.substring
(0,ApplicationConstants.ROOTPATH.indexOf(“\\”)+2);
字符串user=request.getParameter(“用户名”);
logger.info(“ApplicationConstants.ROOTPATH”+ApplicationConstants.ROOTPATH);
logger.info(“用户名”+用户);
尝试
{
for(部分:request.getParts())
{
logger.info(“part=“+part.getName());
如果(!part.getName().equalsIgnoreCase(“用户名”))
{
试一试{
BufferedInputStream in=新的BufferedInputStream(part.getInputStream());
字符串文件名=getFilename(部分);
布尔成功=(新文件(ApplicationConstants.ROOTPATH+user+“\\”).mkdir();
如果(成功){
System.out.println(“目录:“+ApplicationConstants.ROOTPATH+user.trim()+”\\\“+”已创建”);
}
其他的
{
System.out.println(“未创建”);
}
FileOutputStream out=新的FileOutputStream(ApplicationConstants.ROOTPATH+user+“\\”+文件名);
字节[]数据=新字节[1000];
int字节读取=0;
整数偏移=0;
while(偏移量
希望这对别人有帮助 通过使用相关编程语言对问题进行标记,您可以更好地了解问题。通过RESTful web服务上载多个文件的一个很好的示例(客户端和服务器端代码)位于-其他相关主题包括-
private static Logger logger = Logger.getLogger("UploadFiles");
@POST
@Path("savefile")
public void createObjects(@Context HttpServletRequest request)
{
try
{
FileHandler f;
f = new FileHandler(new File (getClass().getResource("/" +getClass().getName().substring(
0, getClass().getName().indexOf("."))).getPath()).getParent().replaceAll("\\\\", "\\\\\\\\") + "/mylog.log");
logger.addHandler(f);
}
catch (SecurityException e1)
{
logger.info(e1.getMessage());
}
catch (IOException e1)
{
logger.info(e1.getMessage());
}
ApplicationConstants.ROOTPATH = new File (getClass().getResource("/" +getClass().getName().substring(
0, getClass().getName().indexOf("."))).getPath()).getParent().replaceAll("\\\\", "\\\\\\\\") ;
ApplicationConstants.ROOTPATH = ApplicationConstants.ROOTPATH.substring
(0, ApplicationConstants.ROOTPATH.indexOf("\\") + 2);
String user = request.getParameter("username");
logger.info("ApplicationConstants.ROOTPATH" + ApplicationConstants.ROOTPATH);
logger.info("username" + user);
try
{
for (Part part : request.getParts())
{
logger.info("part = " + part.getName());
if (!part.getName().equalsIgnoreCase("username"))
{
try {
BufferedInputStream in = new BufferedInputStream(part.getInputStream());
String filename = getFilename(part);
boolean success = (new File(ApplicationConstants.ROOTPATH + user + "\\")).mkdir();
if (success) {
System.out.println("Directory: " + ApplicationConstants.ROOTPATH + user .trim()+ "\\" + " created");
}
else
{
System.out.println("not created");
}
FileOutputStream out = new FileOutputStream(ApplicationConstants.ROOTPATH + user + "\\" + filename);
byte[] data = new byte[1000];
int bytesRead = 0;
int offset = 0;
while (offset < part.getSize())
{
bytesRead = in.read(data);
if (bytesRead == -1)
{
break;
}
offset += bytesRead;
out.write(data);
}
in.close();
if (offset != part.getSize())
{
throw new IOException("Only read " + offset + " bytes; Expected " + part.getSize() + " bytes");
}
out.flush();
out.close();
}
catch (Exception e)
{
logger.info(e.getMessage());
}
}
else
{
BufferedReader reader = new BufferedReader(new InputStreamReader(part.getInputStream(), "UTF-8"));
StringBuilder value = new StringBuilder();
char[] buffer = new char[1024];
reader.read(buffer);
value.append(buffer);
user = value.toString().trim();
logger.info("user = " + value);
}
}
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (ServletException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
}