@@ -0,0 +1,27 @@
+package com.ejlchina.okhttps;
+
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * 下载文件名解析器
+ */
+public class FileNameResolver {
+
+
+    public String resolveFileName(HttpResult result) {
+        String fileName = result.getHeader("Content-Disposition");
+        // 通过 Content-Disposition 获取文件名，这点跟服务器有关，需要灵活变通
+        if (fileName == null || fileName.length() < 1) {
+            fileName = result.getTask().getUrl();
+            fileName = fileName.substring(fileName.lastIndexOf("/") + 1);
+        } else {
+            fileName = URLDecoder.decode(fileName.substring(
+                    fileName.indexOf("filename=") + 9), StandardCharsets.UTF_8);
+            // 有些文件名会被包含在""里面，所以要去掉，不然无法读取文件后缀
+            fileName = fileName.replaceAll("\"", "");
+        }
+        return fileName;
+    }
+
+}
@@ -288,6 +288,16 @@ interface Builder {
 
         String bodyType();
 
+        /**
+         * @since v3.5.0
+         * 设置下载文件名解析器
+         * @param resolver 解析器
+         * @return Builder
+         */
+        Builder fileNameResolver(FileNameResolver resolver);
+
+        FileNameResolver fileNameResolver();
+
         /**
          * 构建 HTTP 实例
          * @return HTTP
 
@@ -26,6 +26,7 @@ public abstract class AbstractHttpClient implements HTTP {
     // 默认的请求体类型
     final String bodyType;
 
+    final FileNameResolver fileNameResolver;
 
     public AbstractHttpClient(HTTP.Builder builder) {
         this.baseUrl = builder.baseUrl();
@@ -36,6 +37,7 @@ public AbstractHttpClient(HTTP.Builder builder) {
         this.charset = builder.charset();
         this.bodyType = builder.bodyType();
         this.tagTasks = new LinkedList<>();
+        this.fileNameResolver = builder.fileNameResolver();
     }
 
 
@@ -302,4 +304,8 @@ public String bodyType() {
         return bodyType;
     }
 
+    public FileNameResolver fileNameResolver() {
+        return fileNameResolver;
+    }
+
 }
@@ -46,6 +46,7 @@ public class OkHttpBuilderImpl implements HTTP.Builder {
 
     private String bodyType = OkHttps.FORM;
 
+    private FileNameResolver fileNameResolver;
 
     public OkHttpBuilderImpl() {
         mediaTypes = new HashMap<>();
@@ -72,6 +73,7 @@ public OkHttpBuilderImpl() {
         preprocessors = new ArrayList<>();
         msgConvertors = new ArrayList<>();
         configs = new ArrayList<>();
+        fileNameResolver = new FileNameResolver();
     }
 
     public OkHttpBuilderImpl(OkHttpClientWrapper hc) {
@@ -95,6 +97,7 @@ public OkHttpBuilderImpl(OkHttpClientWrapper hc) {
         configs = new ArrayList<>();
         bodyType = hc.bodyType();
         charset = hc.charset();
+        fileNameResolver = hc.fileNameResolver();
     }
 
 
@@ -310,4 +313,15 @@ public String bodyType() {
         return bodyType;
     }
 
+    @Override
+    public HTTP.Builder fileNameResolver(FileNameResolver resolver) {
+        fileNameResolver = resolver;
+        return this;
+    }
+
+    @Override
+    public FileNameResolver fileNameResolver() {
+        return fileNameResolver;
+    }
+
 }
Original file line number	Diff line number	Diff line change
`@@ -26,6 +26,7 @@ public abstract class AbstractHttpClient implements HTTP {`
`26`	`26`	`// 默认的请求体类型`
`27`	`27`	`final String bodyType;`
`28`	`28`
	`29`	`+ final FileNameResolver fileNameResolver;`
`29`	`30`
`30`	`31`	`public AbstractHttpClient(HTTP.Builder builder) {`
`31`	`32`	`this.baseUrl = builder.baseUrl();`
`@@ -36,6 +37,7 @@ public AbstractHttpClient(HTTP.Builder builder) {`
`36`	`37`	`this.charset = builder.charset();`
`37`	`38`	`this.bodyType = builder.bodyType();`
`38`	`39`	`this.tagTasks = new LinkedList<>();`
	`40`	`+ this.fileNameResolver = builder.fileNameResolver();`
`39`	`41`	`}`
`40`	`42`
`41`	`43`
`@@ -302,4 +304,8 @@ public String bodyType() {`
`302`	`304`	`return bodyType;`
`303`	`305`	`}`
`304`	`306`
	`307`	`+ public FileNameResolver fileNameResolver() {`
	`308`	`+ return fileNameResolver;`
	`309`	`+ }`
	`310`	`+`
`305`	`311`	`}`