引库

implementation 'com.tom-roush:pdfbox-android:2.0.6.0'

第二步 复制代码

PDDocument document = PDDocument.load(file);
AccessPermission ap = new AccessPermission();
StandardProtectionPolicy spp = new StandardProtectionPolicy(pass, pass, ap);
spp.setEncryptionKeyLength(128);
spp.setPermissions(ap);
document.protect(spp);
document.save(path);
document.close();

第三步 测试
然后下班回家