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public String chooseFileSave(String strTitle,String defaultFileName){
javax.swing.JFileChooser jfileChooser = new javax.swing.JFileChooser();
int rntValue;
String file = null;
jfileChooser.setDialogTitle(strTitle);
jfileChooser.setSelectedFile(new File(defaultFileName)); // 这里设置
rntValue = jfileChooser.showSaveDialog(null);
if(rntValue == javax.swing.JFileChooser.APPROVE_OPTION){
file = jfileChooser.getSelectedFile().getAbsolutePath();
}
else{
file = "";
}
jfileChooser = null;
return file;
}