1、导入证书时在证书前后添加begin，end并添加换行。2、生成数字信封支持P

src/main/java/com/sunyard/util/CoderUtil.java

@@ -171,4 +171,33 @@ public class CoderUtil {
         }
     }
 
+    /**
+     * 将证书前后加上begin和end，中间添加换行
+     * @param certData
+     * @return
+     */
+    public static String certAddHT(String certData) {
+        final String head = "-----BEGIN CERTIFICATE-----\n";
+        final String tail = "-----END CERTIFICATE-----";
+        final String wrap = "\n";
+
+        int num = certData.length() % 64 == 0 ? certData.length() / 64: certData.length() / 64 + 1;
+
+        StringBuilder sb = new StringBuilder();
+        sb.append(head);
+
+        for (int i = 0; i < num; i++) {
+            String substring;
+            if (i == num - 1) {
+                substring = certData.substring(i * 64);
+            } else {
+                substring = certData.substring(i * 64, (i + 1) * 64);
+            }
+            sb.append(substring).append(wrap);
+        }
+        sb.append(tail);
+
+        return sb.toString();
+    }
+
 }