Solve the problem of base64encoder error

Hello everyone , I meet you again , I'm your friend, Quan Jun .

I'm using it today servlet When writing a case of file download , I want to solve the problem of displaying documents in Chinese . Then guide the package import sun.misc.BASE64Encoder when , Find out IDEA Wrong report , This class is not recognized . Finally found in JDK9 after , The official has not supported import sun.misc.BASE64Encoder 了 .

There are a lot of words on the Internet , The first is to put JDK The version of is reduced to 1.8 within . But I don't think this is the best solution . I think we should modify the original code .

So I adopted the official new jar package import java.util.Base64.

The following java The original intention of class is to , Give the file name in different browsers , Modify the corresponding coding format , Make it display Chinese correctly .

This is the use of sun.misc.BASE64Encoder;

import sun.misc.BASE64Encoder;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;


public class DownLoadUtils {

    public static String getFileName(String agent, String filename) throws UnsupportedEncodingException {
        if (agent.contains("MSIE")) {
            // IE browser 
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        } else if (agent.contains("Firefox")) {
            //  Firefox 
            BASE64Encoder base64Encoder = new BASE64Encoder();
            filename = "=?utf-8?B?" + base64Encoder.encode(filename.getBytes("utf-8")) + "?=";
        } else {
            //  Other browsers 
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }
}

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hold BASE64Encoder base64Encoder = new BASE64Encoder(); It is amended as follows Base64.Encoder encoder = Base64.getEncoder();

And put encode() Methods to encodeToString(). Nothing else needs to be modified .

import java.util.Base64;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;


public class DownLoadUtils {

    public static String getFileName(String agent, String filename) throws UnsupportedEncodingException {
        if (agent.contains("MSIE")) {
            // IE browser ( The version is too low to open )
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        } else if (agent.contains("Firefox")) {
            //  Firefox 
            Base64.Encoder encoder = Base64.getEncoder();
            filename = "=?utf-8?B?" + encoder.encodeToString(filename.getBytes("utf-8")) + "?=";
        } else {
            //  Other browsers 
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }
}

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such IDEA It won't be wrong .

Open it with Firefox , The Chinese name can be displayed

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