How to solve Java file upload size limit error exception (FileUploadSizeLimitExceededErrorExceotion)

How to solve Java file upload size limit error exception (FileUploadSizeLimitExceededErrorExceotion)

In Web development, file upload is a common functional requirement. However, the file upload function in Java has a file size limit by default. When the uploaded file size exceeds the limit, the FileUploadSizeLimitExceededErrorExceotion exception will be thrown. This article describes how to solve this problem and provides corresponding code examples.

To solve the file upload size limit error exception, you first need to understand the common solutions. The following are two commonly used methods:

1. Modify the configuration file of the application server
2. Modify the file upload configuration in the code

Next we will Both solutions are described in detail with corresponding code examples.

1. Modify the configuration file of the application server

Most Java application servers (such as Tomcat, Jetty, etc.) allow the size limit of file upload to be set in the configuration file. We can increase the size limit for file uploads by modifying these configuration files.

Taking Tomcat as an example, we can find the following configuration in Tomcat’s configuration file server.xml:

In this configuration, maxSwallowSize represents the maximum acceptable file size, and the default value is -1 means no limit on file size. We can modify it to the size we need, such as 10MB (1010241024):

After the modification is completed, restart the server to take effect.

2. Modify the file upload configuration in the code

If we are unable or unwilling to modify the application server configuration file, we can solve the problem by modifying the file upload configuration in the code.

In Java, the commonly used file upload tool is Apache Commons FileUpload. We can modify the size limit of file upload by setting its parameters.

The following is a sample code:

import org.apache.commons.fileupload.FileUploadBase; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import javax.servlet.http.HttpServletRequest; import java.util.List; public class FileUploadUtils { public static List parseRequest(HttpServletRequest request) throws FileUploadException { DiskFileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); upload.setSizeMax(10 * 1024 * 1024); // 设置文件上传的大小限制为10MB upload.setHeaderEncoding("UTF-8"); return upload.parseRequest(request); } }

In the above code, we specify the size limit for file upload by setting the setSizeMax method of the upload object. Here the size limit for file upload is set to 10MB.

When using this method, we only need to pass in the HttpServletRequest object to get the uploaded file list, and then process the files.

The above are two methods to solve the Java file upload size limit error exception and the corresponding code examples. Just choose a method to solve it according to the actual situation. I hope to be helpful!

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