From 1a3ad048aa43f0b6167764d3ce6ec8736bf58272 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=8B=8F=E8=BF=9E=E4=BA=91?= <562050688@qq.com>
Date: Thu, 13 Jul 2023 09:30:46 +0000
Subject: [PATCH 1/2] =?UTF-8?q?add=20java/Utf8.java.=20=E5=9D=91=E7=82=B9:?=
 =?UTF-8?q?=201.=E8=AF=BB=E5=8F=96=E6=96=87=E4=BB=B6=E5=85=A8=E9=83=A8?=
 =?UTF-8?q?=E5=86=85=E5=AE=B9=202.=E8=AF=BB=E5=8F=96=E6=96=87=E4=BB=B6?=
 =?UTF-8?q?=E5=90=8E=E5=87=BA=E7=8E=B0=E5=BC=82=E5=B8=B8,=E6=89=93?=
 =?UTF-8?q?=E5=8D=B0=E4=B8=80=E4=B8=8B=E5=B0=B1=E5=AE=8C=E4=BA=8B=203.try?=
 =?UTF-8?q?=E5=B5=8C=E5=A5=97=204.isUtf8=20=E5=88=A4=E6=96=AD=E7=9A=84?=
 =?UTF-8?q?=E5=A4=AA=E6=9A=B4=E5=8A=9B=E4=BA=86?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 苏连云 <562050688@qq.com>
---
 java/Utf8.java | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 java/Utf8.java

diff --git a/java/Utf8.java b/java/Utf8.java
new file mode 100644
index 0000000..be63ae6
--- /dev/null
+++ b/java/Utf8.java
@@ -0,0 +1,80 @@
+/**
+     * 如果文件是utf8编码返回true,反之false
+     *
+     * @param file
+     * @return
+     */
+    private Boolean isUtf8(File file) {
+        boolean isUtf8 = true;
+        byte[] buffer = readByteArrayData(file);
+        int end = buffer.length;
+        for (int i = 0; i < end; i++) {
+            byte temp = buffer[i];
+            if ((temp & 0x80) == 0) {
+                continue;
+            } else if ((temp & 0xC0) == 0xC0 && (temp & 0x20) == 0) {
+                if (i + 1 < end && (buffer[i + 1] & 0x80) == 0x80 && (buffer[i + 1] & 0x40) == 0) {
+                    i = i + 1;
+                    continue;
+                }
+            } else if ((temp & 0xE0) == 0xE0 && (temp & 0x10) == 0) {// 1110xxxx 10xxxxxx 10xxxxxx
+                if (i + 2 < end && (buffer[i + 1] & 0x80) == 0x80 && (buffer[i + 1] & 0x40) == 0
+                        && (buffer[i + 2] & 0x80) == 0x80 && (buffer[i + 2] & 0x40) == 0) {
+                    i = i + 2;
+                    continue;
+                }
+            } else if ((temp & 0xF0) == 0xF0 && (temp & 0x08) == 0) {// 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+                if (i + 3 < end && (buffer[i + 1] & 0x80) == 0x80 && (buffer[i + 1] & 0x40) == 0
+                        && (buffer[i + 2] & 0x80) == 0x80 && (buffer[i + 2] & 0x40) == 0
+                        && (buffer[i + 3] & 0x80) == 0x80 && (buffer[i + 3] & 0x40) == 0) {
+                    i = i + 3;
+                    continue;
+                }
+            }
+            isUtf8 = false;
+            break;
+        }
+        return isUtf8;
+    }
+
+     /**
+     * 从文件中直接读取字节
+     *
+     * @param file
+     * @return
+     */
+    private byte[] readByteArrayData(File file) {
+        byte[] rebyte = null;
+        BufferedInputStream bis;
+        ByteArrayOutputStream output;
+        try {
+            bis = new BufferedInputStream(new FileInputStream(file));
+            output = new ByteArrayOutputStream();
+            byte[] byt = new byte[1024 * 4];
+            int len;
+            try {
+                while ((len = bis.read(byt)) != -1) {
+                    if (len < 1024 * 4) {
+                        output.write(byt, 0, len);
+                    } else {
+                        output.write(byt);
+                    }
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+            rebyte = output.toByteArray();
+            if (bis != null) {
+                bis.close();
+            }
+            if (output != null) {
+                output.close();
+            }
+        } catch (FileNotFoundException e) {
+            e.printStackTrace();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        return rebyte;
+    }
\ No newline at end of file
-- 
Gitee


From bb52e366d73934c8ec54d27657aa5b7b97622f3f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=8B=8F=E8=BF=9E=E4=BA=91?= <562050688@qq.com>
Date: Thu, 13 Jul 2023 09:47:41 +0000
Subject: [PATCH 2/2] =?UTF-8?q?add=20java/GetFileType.java.=20=E5=9D=91?=
 =?UTF-8?q?=E7=82=B9:=201.=E9=80=9A=E8=BF=87=E6=96=87=E4=BB=B6=E5=90=8D?=
 =?UTF-8?q?=E7=A7=B0=E5=88=A4=E6=96=AD=E6=96=87=E4=BB=B6=E7=B1=BB=E5=9E=8B?=
 =?UTF-8?q?=202.=E6=9E=81=E5=85=B6=E7=82=B8=E8=A3=82=E7=9A=84equals?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 苏连云 <562050688@qq.com>
---
 java/GetFileType.java | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 java/GetFileType.java

diff --git a/java/GetFileType.java b/java/GetFileType.java
new file mode 100644
index 0000000..8ffdad3
--- /dev/null
+++ b/java/GetFileType.java
@@ -0,0 +1,24 @@
+    public static String GetFileType(String originalFilename) {
+        //获取最后一个.的位置
+        int lastIndexOf = originalFilename.lastIndexOf(".");
+        if (lastIndexOf < 0) {
+            return "";
+        }
+        //获取文件的后缀名 .jpg
+        String suffix = originalFilename.substring(lastIndexOf);
+        if (suffix.equals(".gz")) {
+            return ".gz";
+        } else if (suffix.equals(".zip")) {
+            return ".zip";
+        } else if (suffix.equals(".csv")) {
+            return ".csv";
+        } else if (suffix.equals(".xml")) {
+            return ".xml";
+        } else if (suffix.equals(".xls")) {
+            return ".xls";
+        } else if (suffix.equals(".xlsx")) {
+            return ".xlsx";
+        } else {
+            return "";
+        }
+    }
\ No newline at end of file
-- 
Gitee