java 占位符的问题

Question

package main;
import com.company.MingLuSpider;
import java.io.IOException;
public class Main {
    public static void main(String[] args) throws IOException {
        for (int i = 0; i < 11; i++) {
            if (i == 0) {
                new MingLuSpider().GetRequestData("https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E", i);
            } else {
                System.out.println(i);
                new MingLuSpider().GetRequestData("https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d",i);
            }
        }
    }
}

请问这是为啥？这个%d占位符 报错
报错如下，数字都打印出来了，但是这个占位符貌似报错了

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java.lang.IllegalArgumentException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI.create(URI.java:852)
    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:66)
    at com.company.MingLuSpider.GetRequestData(MingLuSpider.java:28)
    at main.Main.main(Main.java:14)
Caused by: java.net.URISyntaxException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.scanEscape(URI.java:2978)
    at java.net.URI$Parser.scan(URI.java:3001)
    at java.net.URI$Parser.checkChars(URI.java:3019)
    at java.net.URI$Parser.parseHierarchical(URI.java:3111)
    at java.net.URI$Parser.parse(URI.java:3053)
    at java.net.URI.<init>(URI.java:588)
    at java.net.URI.create(URI.java:850)
    ... 3 more
java.lang.IllegalArgumentException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI.create(URI.java:852)
    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:66)
    at com.company.MingLuSpider.GetRequestData(MingLuSpider.java:28)
    at main.Main.main(Main.java:14)
Caused by: java.net.URISyntaxException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.scanEscape(URI.java:2978)
    at java.net.URI$Parser.scan(URI.java:3001)
    at java.net.URI$Parser.checkChars(URI.java:3019)
    at java.net.URI$Parser.parseHierarchical(URI.java:3111)
    at java.net.URI$Parser.parse(URI.java:3053)
    at java.net.URI.<init>(URI.java:588)
    at java.net.URI.create(URI.java:850)
    ... 3 more
java.lang.IllegalArgumentException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI.create(URI.java:852)
    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:66)
    at com.company.MingLuSpider.GetRequestData(MingLuSpider.java:28)
    at main.Main.main(Main.java:14)
Caused by: java.net.URISyntaxException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.scanEscape(URI.java:2978)
    at java.net.URI$Parser.scan(URI.java:3001)
    at java.net.URI$Parser.checkChars(URI.java:3019)
    at java.net.URI$Parser.parseHierarchical(URI.java:3111)
    at java.net.URI$Parser.parse(URI.java:3053)
    at java.net.URI.<init>(URI.java:588)
    at java.net.URI.create(URI.java:850)
    ... 3 more
java.lang.IllegalArgumentException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI.create(URI.java:852)
    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:66)
    at com.company.MingLuSpider.GetRequestData(MingLuSpider.java:28)
    at main.Main.main(Main.java:14)
Caused by: java.net.URISyntaxException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.scanEscape(URI.java:2978)
    at java.net.URI$Parser.scan(URI.java:3001)
    at java.net.URI$Parser.checkChars(URI.java:3019)
    at java.net.URI$Parser.parseHierarchical(URI.java:3111)
    at java.net.URI$Parser.parse(URI.java:3053)
    at java.net.URI.<init>(URI.java:588)
    at java.net.URI.create(URI.java:850)
    ... 3 more
java.lang.IllegalArgumentException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI.create(URI.java:852)
    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:66)
    at com.company.MingLuSpider.GetRequestData(MingLuSpider.java:28)
    at main.Main.main(Main.java:14)
Caused by: java.net.URISyntaxException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.scanEscape(URI.java:2978)
    at java.net.URI$Parser.scan(URI.java:3001)
    at java.net.URI$Parser.checkChars(URI.java:3019)
    at java.net.URI$Parser.parseHierarchical(URI.java:3111)
    at java.net.URI$Parser.parse(URI.java:3053)
    at java.net.URI.<init>(URI.java:588)
    at java.net.URI.create(URI.java:850)
    ... 3 more
java.lang.IllegalArgumentException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI.create(URI.java:852)
    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:66)
    at com.company.MingLuSpider.GetRequestData(MingLuSpider.java:28)
    at main.Main.main(Main.java:14)
Caused by: java.net.URISyntaxException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.scanEscape(URI.java:2978)
    at java.net.URI$Parser.scan(URI.java:3001)
    at java.net.URI$Parser.checkChars(URI.java:3019)
    at java.net.URI$Parser.parseHierarchical(URI.java:3111)
    at java.net.URI$Parser.parse(URI.java:3053)
    at java.net.URI.<init>(URI.java:588)
    at java.net.URI.create(URI.java:850)
    ... 3 more
java.lang.IllegalArgumentException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI.create(URI.java:852)
    at org.apache.http.client.methods.HttpGet.<init>(HttpGet.java:66)
    at com.company.MingLuSpider.GetRequestData(MingLuSpider.java:28)
    at main.Main.main(Main.java:14)
Caused by: java.net.URISyntaxException: Malformed escape pair at index 68: https://gongshang.mingluji.com/beijing/diqu/%E4%B8%9C%E5%9F%8E?page=%d
    at java.net.URI$Parser.fail(URI.java:2848)
    at java.net.URI$Parser.scanEscape(URI.java:2978)
    at java.net.URI$Parser.scan(URI.java:3001)
    at java.net.URI$Parser.checkChars(URI.java:3019)
    at java.net.URI$Parser.parseHierarchical(URI.java:3111)
    at java.net.URI$Parser.parse(URI.java:3053)
    at java.net.URI.<init>(URI.java:588)

Answer 1

%是URL是URL的转义字符，%d不能直接做为URL的一部分，如果是占位符，那在发起网络请求之前需要替换成真实的参数。